Mission accomplished: Rosetta probe crash-lands on comet

Cheers erupted at the European Space Agency on Friday as the Rosetta spacecraft — which traveled 4 billion miles over the course of a decade — made a crash-landing onto the icy comet it has been orbiting for the past two years.

After catching up to Comet 67P and conducting scientific measurements of the rubber-duck shaped ball — bringing back important data to Earth — the probe fired its thrusters into the comet for the final time to get close-up measurements. It also ended Rosetta's run as an orbiter.

The mission was announced over at around 7:20 am ET.

"Today, we got more out of this mission than we ever thought," said Gerhard Schwehm, who was Rosetta's mission manager until his retirement in 2014. "It's a great day. With all of these happy scientists, we must have done the right thing."

Other scientists joked that Rosetta was now a "Sleeping Beauty," which they hope one day could be awaken in a future space mission.

SEE ALSO: Historic Comet Lander to Be Switched Off Forever

Rosetta, and its companion Philae lander, have given scientists a trove of information to help shed new light on the beginnings of the solar system. Here's a look at a few memorable moments from the mission.

Catching up to a Speeding Comet

Rosetta made history when it reached Comet 67P on August 6, 2015, marking the culmination of a 10-year, four-billion-mile journey. Its Philae landed on Comet 67P on November 12, 2014.

While the event was historic, Philae had a bouncy landing, coming to rest in a position that obscured some of its solar panels. The landing spot led to Philae having intermittent contact with Rosetta, which was its line of communication back to Earth.

See the landing of the Rosetta Probe:

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Rosetta Probe landing
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Rosetta Probe landing
A telemetry data display is seen in the main control room of the European Space Operation Center (ESOC) in Darmstadt, on September 30, 2016 after the controlled descent of the European Space Agency (ESA) space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko. Europe's Rosetta spacecraft was heading Friday for a mission-ending crash into the comet it has stalked for two years, a dramatic conclusion to a 12-year odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
Engineers and scientists react in the main control room of the European Space Operation Center (ESOC) in Darmstadt, on September 30, 2016 after the controlled descent of the European Space Agency (ESA) space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko. Europe's Rosetta spacecraft was heading Friday for a mission-ending crash into the comet it has stalked for two years, a dramatic conclusion to a 12-year odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
Engineers and scientists react in the main control room of the European Space Operation Center (ESOC) in Darmstadt, on September 30, 2016 after the controlled descent of the European Space Agency (ESA) space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko. Europe's Rosetta spacecraft was heading Friday for a mission-ending crash into the comet it has stalked for two years, a dramatic conclusion to a 12-year odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
Engineers and scientists react in the main control room of the European Space Operation Center (ESOC) in Darmstadt, on September 30, 2016 after the controlled descent of the European Space Agency (ESA) space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko. Europe's Rosetta spacecraft was heading Friday for a mission-ending crash into the comet it has stalked for two years, a dramatic conclusion to a 12-year odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
The main control room the European Space Operation Center (ESOC) in Darmstadt, Germany, is pictured on September 30, 2016 during the controlled descent of the European Space Agency (ESA) space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko. Europe's Rosetta spacecraft was heading Friday for a mission-ending crash into the comet it has stalked for two years, a dramatic conclusion to a 12-year odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
Chocolates in the shape of comet 67P 'Churi' are pictured at the European Space Operation Center (ESOC) in Darmstadt, Germany, during the controlled descent of the European Space Agency (ESA) space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko, on September 30, 2016. Europe's Rosetta spacecraft made a planned impact Friday with the comet it has orbited and probed for 12 years, dramatically concluding a pioneering odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
The main control room the European Space Operation Center (ESOC) in Darmstadt, Germany, is pictured on September 30, 2016 during the controlled descent of the European Space Agency (ESA) space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko. Europe's Rosetta spacecraft was heading Friday for a mission-ending crash into the comet it has stalked for two years, a dramatic conclusion to a 12-year odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
Alvaro Gimenez Canete, ESA Director of Science addresses the audience at the European Space Operation Center (ESOC) in Darmstadt, Germany, during the controlled descent of the European Space Agency (ESA) space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko, on September 30, 2016. Europe's Rosetta spacecraft was heading Friday for a mission-ending crash into the comet it has stalked for two years, a dramatic conclusion to a 12-year odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
Andrea Accomazzo, Spacecraft Operations Manager at the European Space Agency (ESA), smiles during the controlled descent of the ESA space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko on September 30, 2016, surveyed from the main control room of ESA's European Space Operations Centre (ESOC) in Darmstadt, western Germany. Europe's Rosetta spacecraft was headed for a mission-ending crash on the comet it has stalked for two years, a dramatic conclusion to a 12-year odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
Engineers work at the main control room of the European Space Operations Centre (ESOC) of the European Space Agency (ESA) in Darmstadt, western Germany, during the controlled descent of the ESA space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko, on September 30, 2016. Europe's Rosetta spacecraft was headed for a mission-ending crash on the comet it has stalked for two years, a dramatic conclusion to a 12-year odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
A model of the space probe Rosetta is pictured at the headquarters of the European Space Operations Centre (ESOC) of the European Space Agency (ESA) in Darmstadt, western Germany, on September 30, 2016, the day of the controlled descent of the ESA space probe Rosetta onto the surface of Comet 67P/Churyumov-Gerasimenko. Europe's Rosetta spacecraft was headed for a mission-ending crash on the comet it has stalked for two years, a dramatic conclusion to a 12-year odyssey to demystify our Solar System's origins. / AFP / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
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This Comet Sings

Scientists were expecting to see a lot on Comet 67P, but they never expected it would greet them with a song. It's believed the song comes from oscillations in the comet's magnetic field, according to the ESA.

Going Beneath the Surface of 67P

You'd expect the interior of a comet to be stone cold, but Rosetta has a soft side.

Using radio waves, Rosetta and Philae were able to give scientists a picture of what the interior of the comet looks like.

Comets are mixtures of dust and ice. However, scientists were surprised to learn 67P is porous and comprised of fluffy dust particles mixed with ice, proving the old comet is a big softie inside after all.

Check out the history of the Rosetta probe:

42 PHOTOS
Rosetta comet chaser - space - European Space Agency
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Rosetta comet chaser - space - European Space Agency
This November 13, 2014 handout photo provided by the European Space Agency (ESA) shows the surface of the 67P/Churyumov-Gerasimenko comet as seen from the Philae lander, which landed on the comet's surface. (Photo ESA via Getty Images)
This November 13, 2014 handout photo provided by the European Space Agency (ESA) shows the first panoramic 'postcard' from the surface of a comet returned by Rosetta's lander Philae. (Photo ESA via Getty Images)
We're signing off shortly, but we leave you with replay hlighlights of this afternoon's events https://t.co/K4IRFgsn2y
AUGUST 3: In this handout from the European Space Agency (ESA), the comet Comet 67P/Churyumov-Gerasimenko is seen in a photo taken by the Rosetta spacecraft with the OSIRIS narrow-angle camera August 3, 2014 in space. ESA's Rosetta spacecraft became the first to rendezvous with a comet and will follow it on the journey around the sun. (Photo by ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA via Getty Images)
"Maybe today we didn't just land once...we even landed twice!" #cometlanding https://t.co/SMzkcRTVWg
History has been made!! #rosetta has landed on the comet! The instant reaction in the media room at ESA in Darmstadt, Germany
I’m on the surface but my harpoons did not fire. My team is hard at work now trying to determine why. #CometLanding
DARMSTADT, GERMANY - NOVEMBER 12: (EDITORIAL USE ONLY) In this November 12, 2014 handout photo provided by the European Space Agency (ESA) the Philae lander is pictured on its way to the 67P/Churyumov-Gerasimenko comet after a successful separation from the Rosetta probe. The image was taken with the lander's CIVA-P imaging system and captures one of Rosetta's 14 metre-long solar arrays. ESA later successfully landed Philae, making it the first man-made craft to ever land on a comet. The Philae lander, launched from the Rosetta probe, is a mini laboratory that will gather data on the comet. (Photo ESA via Getty Images)
Before we go, thanks to all of you for sharing this epic day with us and for all your messages cheering us on! #cometlanding
DARMSTADT, GERMANY - NOVEMBER 12: (EDITORIAL USE ONLY) In this November 12, 2014 handout photo provided by the European Space Agency (ESA) the Philae lander is pictured on its way to the 67P/Churyumov-Gerasimenko comet after a successful separation from the Rosetta probe. ESA later successfully landed Philae, making it the first man-made craft to ever land on a comet. The Philae lander, launched from the Rosetta probe, is a mini laboratory that will gather data on the comet. (Photo ESA via Getty Images)
.@WilliamShatner touchdown confirmed for away team @philae2014, captain!
A model of the landing module 'Philae' is pictured at the ESA/ESOC (European Space Agency / European Space Operation Center) in Darmstadt, western Germany, on November 12, 2014, as European probe Philae is poised to land on a comet, the culmination of a historic quest to explore an enigma of the Solar System. After a trek of more than a decade, the mini lab called Philae separated on schedule from its mother ship Rosetta. Philae is to land on 67P/Churyumov-Gerasimenko, a comet now more than 510 million kilometres (320 million miles) from Earth and racing towards the Sun. AFP PHOTO / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
Scientistswait for the first picture transmitted by the European Space Agency's (ESA) robot craft Philae, in the scientific mission observation centre of the French space agency Centre National d'Etudes Spatiales (CNES) in Toulouse, southern France, on November 12, 2014, as Philae carries out a 20-kms (12-mile) descent toward the Churyumov-Gerasimenko comet after being launched from space probe Rosetta, following a 10-year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
Thank you for the wonderful messages of support today; I’ll keep an eye on @philae2014 & we’ll have a status update tomorrow #CometLanding
National Centre for Space Studies (CNES) president Jean-Yves Le Gall (L), French President Francois Hollande and French astrophysicist Francis Rocard look at a model of Rosetta lander Philae during a broadcast of the Rosetta mission on the 67P/Churyumov-Gerasimenko comet at the Cite des Sciences in Paris on November 12, 2014. A European probe made the first-ever landing on a comet in a quest to explore the origins of the Solar System, but there were concerns over whether it was fastened securely enough to carry out its mission. AFP PHOTO/POOL/JACQUES BRINON (Photo credit should read JACQUES BRINON/AFP/Getty Images)
DARMSTADT, GERMANY - NOVEMBER 12: Scientists celebrate in the main control room at ESA's Operations Centre, ESOC, as separation of the Philae lander from ESA Rosetta orbiter is confirmed on November 12, 2014. The lander separated from Rosetta earlier on Wednesday and headed towards the surface of the comet Churyumov-Gerasimenko 67P which is moving at the speed of more than 80,000 miles (128,747 kilometers) per hour. The probe is named after the Rosetta stone, a stele of Egyptian origin and the lander is named after Philae, an island in Lake Nasser, Egypt. (Photo by European Space Agency/Pool/Anadolu Agency/Getty Images)
Journalists film near a giant screen featuring Andrea Accomazzo (C), Rosetta flight operations director celebrating with European Space Agency (ESA) scientists after the announcement of the first-ever landing on a comet, done by European probe Philae, at theESA/ESOC in Darmstadt, western Germany, on November 12, 2014. The mini lab called Philae landed on 67P/Churyumov-Gerasimenko comet climaxing a historic quest to explore one of the enigmas of the Solar System. AFP PHOTO / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
Scientists look at the first picture transmitted by the European Space Agency's (ESA) robot craft Philae, in the scientific mission observation centre of the French space agency Centre National d'Etudes Spatiales (CNES) in Toulouse, southern France, on November 12, 2014, as Philae carries out a 20-kms (12-mile) descent toward the Churyumov-Gerasimenko comet after being launched from space probe Rosetta, following a 10-year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
Scientists look on a computer screen at the first picture transmitted by the European Space Agency's (ESA) robot craft Philae, in the scientific mission observation centre of the French space agency Centre National d'Etudes Spatiales (CNES) in Toulouse, southern France, on November 12, 2014, as Philae carries out a 20-kms (12-mile) descent toward the Churyumov-Gerasimenko comet after being launched from space probe Rosetta, following a 10-year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
Scientists look on a computer screen at the first picture transmitted by the European Space Agency's (ESA) robot craft Philae, in the scientific mission observation centre of the French space agency Centre National d'Etudes Spatiales (CNES) in Toulouse, southern France, on November 12, 2014, as Philae carries out a 20-kms (12-mile) descent toward the Churyumov-Gerasimenko comet after being launched from space probe Rosetta, following a 10-year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
Scientists work in the scientific mission observation centre of the French space agency Centre National d'Etudes Spatiales (CNES) in Toulouse, southern France, on November 12, 2014, as they wait for the European Space Agency's (ESA) robot craft Philae to land on the Churyumov-Gerasimenko comet after being launched from European space probe Rosetta, following a ten year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
A scientist wears a t-shirt depicting the European Space Agency's (ESA) robot craft Philae in the scientific mission observation centre of the French space agency Centre National d'Etudes Spatiales (CNES) in Toulouse, southern France, on November 12, 2014, as Philae carries out a descent to land on the Churyumov-Gerasimenko comet after being launched from European space probe Rosetta, following a ten year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
Scientists look on a computer screen at the first picture transmitted by the European Space Agency's (ESA) robot craft Philae, in the scientific mission observation centre of the French space agency Centre National d'Etudes Spatiales (CNES) in Toulouse, southern France, on November 12, 2014, as Philae carries out a 20-kms (12-mile) descent toward the Churyumov-Gerasimenko comet after being launched from space probe Rosetta, following a 10-year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
Scientists work in the scientific mission observation centre of the French space agency Centre National d'Etudes Spatiales (CNES) in Toulouse, southern France, on November 12, 2014, as they wait for the European Space Agency's (ESA) robot craft Philae to land on the Churyumov-Gerasimenko comet after being launched from European space probe Rosetta, following a ten year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
IN SPACE - AUGUST 3: In this handout from the European Space Agency (ESA), the comet Comet 67P/Churyumov-Gerasimenko is seen in a detail photo taken by the Rosetta spacecraft with the OSIRIS narrow-angle camera August 3, 2014 in space. ESA's Rosetta spacecraft became the first to rendezvous with a comet and will follow it on the journey around the sun. (Photo by ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA via Getty Images)
The logo of the European Space Agency (ESA) is seen at the ESA/ESOC (European Space Agency / European Space Operation Center) in Darmstadt, western Germany, on November 12, 2014, as European probe Philae is poised to land on a comet, the culmination of a historic quest to explore an enigma of the Solar System. After a trek of more than a decade, the mini lab called Philae separated on schedule from its mother ship Rosetta. Philae is to land on 67P/Churyumov-Gerasimenko, a comet now more than 510 million kilometres (320 million miles) from Earth and racing towards the Sun. AFP PHOTO / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
A woman sits beside a computer screen where is seen the first picture transmitted by the European Space Agency's (ESA) robot craft Philae, in the scientific mission observation centre of the French space agency Centre National d'Etudes Spatiales (CNES) in Toulouse, southern France, on November 12, 2014, as Philae carries out a 20-kilometre (12-mile) descent toward the Churyumov-Gerasimenko comet after being launched from space probe Rosetta, following a ten year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
A man stands near a model of the European Space Agency's (ESA) robot craft Philae as he visits the Cite de l'espace (Space City) in Toulouse, southern France, on November 12, 2014, on the day Philae began a 20-kilometre (12-mile) descent toward the Churyumov-Gerasimenko comet after being launched from the space probe Rosetta, following a ten year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
Scientists follow the flight of the Rosetta spacecraft from the control centre of the European Space Agency (ESA) in Darmstadt, western Germany, on August 6, 2014. After a decade-long quest spanning six billion kilometres the European Rosetta probe comes face to face with the Comet 67P/Churyumov-Gerasimenko. The moment marks a key phase of the most ambitious project ever undertaken by the European Space Agency. (BORIS ROESSLER/AFP/Getty Images)

Using the CIVA camera on Rosetta's Philae lander, the spacecraft have snapped a 'selfie' at comet 67P/Churyumov–Gerasimenko from a distance of about 16 km from the surface of the comet. The image was taken on 7 October and captures the side of the Rosetta spacecraft and one of Rosetta's 14 m-long solar wings, with the comet in the background.

Two images with different exposure times were combined to bring out the faint details in this very high contrast situation. The comet's active 'neck' region is clearly visible, with streams of dust and gas extending away from the surface. (European Space Agency)

What @philae2014 will do to keep busy during the 7hr descent to #67P: http://t.co/xEDMqcURZT #CometLanding http://t.co/EiOomNLg4p
In this handout illustration from the European Space Agency (ESA), the Rosetta spacecraft is seen. ESA's Rosetta spacecraft became the first to rendezvous with a comet and will follow it on the journey around the sun. (Photo by ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA via Getty Images)
How I’m going to get into position to deploy @philae2014 (& what I do afterwards!): http://t.co/Z2A14IxE6U #67P #CometLanding
AUGUST 3: In this handout from the European Space Agency (ESA), the comet Comet 67P/Churyumov-Gerasimenko is seen in a photo taken by the Rosetta spacecraft with the OSIRIS narrow-angle camera August 3, 2014 in space. ESA's Rosetta spacecraft became the first to rendezvous with a comet and will follow it on the journey around the sun. (Photo by ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA via Getty Images)
Scientists follow the flight of the Rosetta spacecraft from the control centre of the European Space Agency (ESA) in Darmstadt, western Germany, on August 6, 2014. After a decade-long quest spanning six billion kilometres the European Rosetta probe comes face to face with the Comet 67P/Churyumov-Gerasimenko. The moment marks a key phase of the most ambitious project ever undertaken by the European Space Agency. (BORIS ROESSLER/AFP/Getty Images)
Scientists work in the scientific mission observation centre of the French space agency Centre National d'Etudes Spatiales (CNES) in Toulouse, southern France, on November 12, 2014, as they wait for the European Space Agency's (ESA) robot craft Philae to land on the Churyumov-Gerasimenko comet after being launched from the space probe Rosetta, following a ten year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
The entrance of the ESA/ESOC (European Space Agency / European Space Operation Center) in Darmstadt, western Germany, is pictured on November 12, 2014, as European probe Philae is poised to land on a comet, the culmination of a historic quest to explore an enigma of the Solar System. After a trek of more than a decade, the mini lab called Philae separated on schedule from its mother ship Rosetta. Philae is to land on 67P/Churyumov-Gerasimenko, a comet now more than 510 million kilometres (320 million miles) from Earth and racing towards the Sun. AFP PHOTO / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
DARMSTADT, GERMANY - NOVEMBER 12: The European Space Agency's Rosetta probe is set to make history by landing its robot craft Philae on a comet on November 12, 2014. The lander separated from Rosetta earlier on Wednesday and headed towards the surface of the comet Churyumov-Gerasimenko 67P which is moving at the speed of more than 80,000 miles (128,747 kilometers) per hour. The probe is named after the Rosetta stone, a stele of Egyptian origin and the lander is named after Philae, an island in Lake Nasser, Egypt. (Photo by European Space Agency/Pool/Anadolu Agency/Getty Images)
A picture shows a model of the European Space Agency's (ESA) robot craft Philae at the the Cite de l'espace (Space City) in Toulouse, southern France, on November 12, 2014, the day Philae began a 20-kilometre (12-mile) descent toward the Churyumov-Gerasimenko comet after being launched from the space probe Rosetta, following a ten year journey. Europe's Rosetta spacecraft made contact with its robot craft Philae soon after the lander embarked on November 12 on a solo, seven-hour descent to a comet, ground controllers said. Astrophysicists hope Philae will unlock knowledge about the origins of the Solar System and even life on Earth, which some believe may have started with comets 'seeding' the planet with life-giving carbon molecules and water. AFP PHOTO / REMY GABALDA (Photo credit should read REMY GABALDA/AFP/Getty Images)
Journalists film near a giant screen featuring Andrea Accomazzo (C), Rosetta flight operations director celebrating with European Space Agency (ESA) scientists after the announcement of the first-ever landing on a comet, done by European probe Philae, at theESA/ESOC in Darmstadt, western Germany, on November 12, 2014. The mini lab called Philae landed on 67P/Churyumov-Gerasimenko comet climaxing a historic quest to explore one of the enigmas of the Solar System. AFP PHOTO / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
Journalists film near a giant screen featuring Andrea Accomazzo (R), Rosetta flight operations director celebrating with European Space Agency (ESA) scientists after the announcement of the first-ever landing on a comet, done by European probe Philae, at the ESA/ESOC in Darmstadt, western Germany, on November 12, 2014. The mini lab called Philae landed on 67P/Churyumov-Gerasimenko comet climaxing a historic quest to explore one of the enigmas of the Solar System. AFP PHOTO / DANIEL ROLAND (Photo credit should read DANIEL ROLAND/AFP/Getty Images)
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Mystery Deepens: How Did Earth Get Its Water?

One of the most surprising findings challenged the theory that water was brought to Earth by comets. Rosetta's instruments analyzed the signature of water vapor on 67P and determined the comet's water wasn't a match for the structure of Earth's H2O.

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