This space mission could save Earth from killer asteroids — but NASA keeps hitting the snooze button

On January 4, NASA announced two new space missions to explore the solar system: Lucy, a probe that will visit swarms of ancient asteroids lurking near Jupiter, and Psyche, which will orbit the all-metal core of a dead planet.

These winners of the Discovery program, as it's known, will each get $450 million to build their robots, plus a rocket to launch them.

"This is what Discovery Program missions are all about — boldly going to places we've never been to enable groundbreaking science," Thomas Zurbuchen, the associate administrator of NASA's Science Mission Directorate, said in a Jan. 4 press release.

Related: NASA's best photos of 2016

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NASA's best photos of 2016
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NASA's best photos of 2016

Sunset From the International Space Station

Expedition 47 Flight Engineer Jeff Williams of NASA captured a series of photos for this composite image of the setting sun reflected by the ocean.

Photo Credit: NASA

Space Station Flight Over the Southern Tip of Italy

The southern tip of Italy is visible in this image taken by the Expedition 49 crew aboard the International Space Station on Sept. 17, 2016. The brightly lit city of Naples can be seen in the bottom section of the image. A Russian Soyuz spacecraft can be seen in the foreground.

Photo Credit: NASA

Star Trails Seen From Low Earth Orbit

Astronauts on the International Space Station captured a series of incredible star trail images on Oct. 3, 2016, as they orbited at 17,500 miles per hour. The station orbits the Earth every 90 minutes, and astronauts aboard see an average of 16 sunrises and sunsets every 24 hours.

Photo Credit: NASA

Many Fantastic Colors

The Nili Fossae region, located on the northwest rim of Isidis impact basin, is one of the most colorful regions of Mars. This region is ancient and has had a complicated geologic history, leading to interesting structures like layered bedrock, as well as other compositions.

Photo Credit: NASA

Wind Carved Rock on Mars

The distinctively fluted surface and elongated hills in this image in Medusae Fossae are caused by wind erosion of a soft fine-grained rock. Called yardangs, these features are aligned with the prevailing wind direction. This wind direction would have dominated for a very long time to carve these large-scale features into the exposed rock.

Photo Credit: NASA

Rains of Terror on Exoplanet HD 189733b

This Halloween, take a tour with NASA's Exoplanet Exploration site of some of the most terrifying destinations in our galaxy. The nightmare world of HD 189733 b is the killer you never see coming. To the human eye, this far-off planet looks bright blue. But any space traveler confusing it with the friendly skies of Earth would be badly mistaken.

Photo Credit: NASA

Aurora and Manicouagan Crater

An astronaut aboard the International Space Station adjusted the camera for night imaging and captured the green veils and curtains of an aurora that spanned thousands of kilometers over Quebec, Canada.

Photo Credit: NASA

Paris at Night

Around local midnight time on April 8, 2015, astronauts aboard the International Space Station took this photograph of Paris, often referred to as the “City of Light.” The pattern of the street grid dominates at night, providing a completely different set of visual features from those visible during the day.

Photo Credit: NASA

Stargazing From the International Space Station

Astronauts aboard the International Space Station (ISS) see the world at night on every orbit — that’s 16 times each crew day. An astronaut took this broad, short-lens photograph of Earth’s night lights while looking out over the remote reaches of the central equatorial Pacific Ocean.

Photo Credit: NASA

Election Day 2016

Thanks to a bill passed by Texas legislators that put in place technical voting procedure for astronauts, they have the ability to vote from space through specially designed absentee ballots. To preserve the integrity of the secret vote, the ballot is encrypted and only accessible by the astronaut and the county clerk responsible for casting it.

Photo Credit: NASA

Fiery South Atlantic Sunset

An astronaut aboard the International Space Station photographed a sunset that looks like a vast sheet of flame. With Earth’s surface already in darkness, the setting sun, the cloud masses, and the sideways viewing angle make a powerful image of the kind that astronauts use to commemorate their flights.

Photo Credit: NASA

Ring Details on Display

This view from NASA's Cassini spacecraft showcases some of the amazingly detailed structure of Saturn's rings.

Photo Credit: NASA

Hubble Takes Flight with the Toucan and the Cluster

NGC 299 is an open star cluster located within the Small Magellanic Cloud just under 200,000 light-years away.

Photo Credit: NASA

Hubble Spies Spiral Galaxy

Spiral galaxy NGC 3274 is a relatively faint galaxy located over 20 million light-years away in the constellation of Leo (The Lion).

Photo Credit: NASA

Practicing Orion Spacecraft Recovery After Splashdown

A group of U.S. Navy divers, Air Force pararescuemen and Coast Guard rescue swimmers practice Orion underway recovery techniques in the Neutral Buoyancy Laboratory at NASA’s Johnson Space Center to prepare for the first test flight of an uncrewed Orion spacecraft with the agency’s Space Launch System rocket during Exploration Mission (EM-1).

Photo Credit: NASA

A Trio of Plumes in the South Sandwich Islands

On September 29, 2016, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite captured this false-color image (MODIS bands 7-2-1) showing volcanic activity in the South Sandwich Islands. Located in the South Atlantic Ocean, the uninhabited South Sandwich Islands include several active stratovolcanoes.

Photo Credit: NASA

Infrared Echoes of a Black Hole Eating a Star

This illustration shows a glowing stream of material from a star, disrupted as it was being devoured by a supermassive black hole. The feeding black hole is surrounded by a ring of dust. This dust was previously illuminated by flares of high-energy radiation from the feeding black hole, and is now shown re-radiating some of that energy.

Photo Credit: NASA

Hubble Views a Colorful Demise of a Sun-like Star

This star is ending its life by casting off its outer layers of gas, which formed a cocoon around the star's remaining core.

Credit: NASA

Infrared Saturn Clouds

This false-color view from NASA's Cassini spacecraft shows clouds in Saturn's northern hemisphere. The view was made using images taken by Cassini's wide-angle camera on July 20, 2016, using a combination of spectral filters sensitive to infrared light at 750, 727 and 619 nanometers.

Photo credit: NASA

Moonset Viewed From the International Space Station

Expedition 47 Flight Engineer Tim Peake of ESA took this striking photograph of the moon from his vantage point aboard the International Space Station on March 28, 2016. Peake shared the image on March 30 and wrote to his social media followers, "I was looking for #Antarctica – hard to spot from our orbit. Settled for a moonset instead."

Photo credit: NASA

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But in a pile of rejected finalists, sitting alongside two conceptual missions to Venus, is a space telescope that might one day save countless lives on Earth from a killer asteroid: a threat Zurbuchen himself has said is "not a matter of if — but when."

It's called the Near-Earth Objects Camera, or NEOCam, and it promises to discover tens of thousands of rogue space rocks roughly 460 feet (140 meters) in diameter or bigger. That size is by design: Congress passed a law in 2005 charging NASA — as one of its seven explicitly stated goals — to find 90% of such near-Earth objects (NEOs) by 2020.

The reason is because asteroids and comets of this size are notoriously difficult to detect, yet can slug our planet or explode in our atmosphere with the energy of least 60 megatons' worth of TNT. That's more powerful than the largest nuclear weapon ever detonated.

SEE MORE: NASA finally shares incredible video of 2005 landing on Saturn's moon

"You do that over a city, and it's a very, very bad day," Mark Sykes, director of the Planetary Science Institute and a scientist on the NEOCam team, told Business Insider. "It's important to look at your neighborhood, from a planetary defense standpoint."

While NASA did commit to partially fund NEOCam for a year, it's effectively the space agency's third pass on launching the telescope in a decade. (The mission was submitted in two previous rounds of Discovery.)

Meanwhile, NASA is running years behind its Congressional mandate to find NEOs, and Earth is mostly blind to threats that might one day level a city.

Just this past Monday, for instance, an asteroid possibly as large as a 10-story building flew past Earth closer than the moon at 9.8 miles per second (15.7 kilometers per second) — and yet astronomers only learned of its existence 2 days beforehand.

We live on a moving target for killer space rocks

near earth asteroid 1950 da nasa jplNASA/JPL-Caltech

Astronomers like to say Earth is drifting through a cosmic shooting gallery.

It's no wonder why.

Any space rock that zooms within 125 million miles (200 million kilometers) of Earth is considered an NEO, and — so far — humanity has located about 15,500 such objects. Relative to Earth, the average one is about 30 million miles (50 million kilometers) away and moving between 27,000 mph (12 kilometers per second) and 45,000 mph (20 kilometers per second) — akin to flying the length of Manhattan once a second.

About 9% of these NEOs, or some 1,759 space rocks, are called "potentially hazardous" objects (PHOs), meaning they come within 4.6 million miles (7.48 million kilometers) of Earth.

Their sizes vary wildly, so a strike could mean anything from broken windows, like the 2013 asteroid-caused air burst over Chelyabinsk, Russia, to global extinction, like the impact that helped wipe out the dinosaurs 65 million years ago.

The animation below, by Scott Manley, shows what the playing field looks like these days, and it is not comforting. Planets are teal (Earth is the third one from center), yellow and red show NEOs (red means they cross Earth's orbit), and green shows more distant, main-belt asteroids:

But these are just the ones we know about.

Roughly 72% of all NEOs that are 460 feet (140 meters) or larger have not been found, according to the "National Near-Earth Object Preparedness Strategy", a report published by the White House's National Science and Technology Council (NSTC) in December 2016. This amounts to about 25,000 nearby asteroids and roughly 2,300 hazardous ones.

That doesn't mean we shouldn't be worried about smaller space rocks, though; in fact, quite the opposite.

"An asteroid much smaller, just 45 meters [150 feet] across, exploded in 1908 over Tunguska with an explosive energy of several megatons and destroyed an area as large as New York City," Roger Blandford, a physicist at Stanford University, wrote in a September 2015 op-ed for Space News. "Congress calls these smaller asteroids 'city killers,' and although they are 30 times more numerous, we have located less than 1% of them."

In raw numbers, "over 300,000 objects greater than 40 meters [130 feet] in size could be an impact hazard to the Earth and have not yet been detected," according to NSTC's report.

The chart below, recently created by NASA's Jet Propulsion Laboratory and Caltech, sums up the gaping holes (in green) of NEO survey efforts thus far:

near earth asteroid census chart graphic wise nasa jplNASA/JPL-Caltech

Tunguska event-like asteroids strike Earth about once every 100-200 years, and Chelyabinsk explosions should occur as much as once a decade, according to a 2013 study in Nature.

Which is why scientists Sykes desperately want to find and, if necessary, deflect or destroy these rogue space rocks.

"There's nothing out there that is anywhere near ready to [detect asteroids], except for NEOCam," Sykes said.

How NEOCam could help save Earth

asteroids asteroid field star nasa jpl 717846main_pia16610_fullNASA/JPL-Caltech

If you're a space rock, you reflect sunlight. Telescopes that are looking in the right place at the right time can see you as a dot sneaking across the blackness of space, allowing scientists to calculate your mass, speed, orbit, and the odds that you'll smack into Earth.

If you're a small NEO, though, you aren't very bright. This means a telescope has to be very big and use very advanced hardware to find you — but big, bad telescopes are expensive and take a very long time to build and calibrate.

Take the Large Synoptic Survey Telescope (LSST), for example, which is one of Earth's best current hopes of finding killer asteroids. The project broke ground in 2015 and is expected to cost upwards of $465 million to build. Based on its current construction schedule, it won't be fully operational until late 2021, at the soonest, or able to fulfill the 90% detection goal set by Congress until the mid-2030s — more than a decade behind-schedule.

LSST, like all ground-based observatories, also comes with two major limitations.

The first: "You can't see asteroids near the sun. You're blinded by the sky," Sykes said. "Right now we have to wait until those pop out in front of us. To get those guys, you really need to be in space — where you're not blinded by the sky."

Sykes said the other snag is that ground-based telescopes mainly rely on visible light for detection.

"If [an asteroid] has a dark surface, it's going to be very hard to see," he said.

neocam infrared camera sensor teledyneNASA/JPL-Caltech

NEOCam goes after these two problems by being in space, where no atmospheric gases get in the way, and by using an advanced, high-resolution infrared (IR) camera.

IR light is a longer wavelength of light that's invisible to our eyes, but if a source is strong enough — say, a roaring fire — we can feel it as warmth on our skin.

Sun-warmed asteroids emit infrared light, even when they're coasting through the void, or are too dark for ground-based telescopes to see. Which means NEOCam could spot them by their heat signatures.

The approach works. The prime example is NASA's 8-year-old Wide-field Infrared Survey Explorer (WISE) telescope, which has found at least 230 NEOs and 42 PHOs from orbit.

However, it's a less powerful telescope, has a smaller field of view, an older camera that requires cryogenic cooling (NEOCam's does not), and wasn't designed solely to hunt asteroids. While scientists gave it a new mission to do so in 2013, renaming the project NEOWISE, the telescope is scheduled to end operations in March 2017.

"[A] space-based observatory, working in concert with observations from ground-based telescopes, may be the best approach to detecting, tracking, and characterizing the NEO population," the NSTC's December 2016 report states. "This combination would more rapidly complete the survey of objects larger than 140 meters [460 feet] while greatly improving our understanding of the hazard from the 50-140 meter [160-460 feet] NEO population."

The NEOCam team proposed to launch in 2021 and find two-thirds of missing objects in the larger-than-460-feet (140 meters) category within 4 years — about a decade ahead of LSST's schedule.

This would help address the NSTC's concern on the issue:

"Finding NEOs as early as possible is the first priority for planetary defense, in order to give adequate time to make decisions and implement courses of action. This fact must be stressed: the earlier a NEO threat is detected, the better the emergency response to the threat will be."

So if launching a capable replacement for NEOWISE is a priority, why didn't NASA pick it?

The forces keeping NEOCam grounded

near earth object asteroids neos nasa m15 091bNASA/JPL-Caltech

Only NASA knows why it didn't pick NEOCam for launch, but it isn't telling anyone, not even Sykes and his colleagues — at least not yet.

The space agency first wants to debrief the NEOCam team on the snags it saw with of its Discovery program proposal, a meeting that a NASA representative said will happen as early as next week.

"The Discovery review process identified strengths and weaknesses for all 5 mission proposals. As with Lucy and Psyche, NEOCam will be asked to address any issues that were raised in the review," David Schurr, deputy director of NASA's planetary science program, told Business Insider in an emailed statement.

During NEOCam's debriefing, the space agency will "work and negotiate with the [...] team" on a funding level for the next year, Jim Green, director of NASA's planetary science division, told reporters during a Jan. 4 NASA teleconference.

"Whether it's a drip or a flood, we'll find out soon," Sykes said.

After that year of funding runs out, however, all bets are currently off: NASA will have to "look for money" under a new presidential administration, according to Green, if it wants to keep the project alive. ("No flow, no go," Sykes said.)

The hangup with NEOCam is not likely any lack of engineering prowess — "the rumor is that there were no major weaknesses [with the proposal]," one source who asked not to be named told Business Insider — but rather a bureaucratic technicality: a case of trying to jam a square peg into a round hole.

psyche asteroid nasa discovery mission linda elkins tanton youtubeNASA/JPL-CaltechThat's because the mandate of NASA's Discovery program is to pull off scientific "firsts" in the solar system.

An unprecedented mission to the metal core of a dead planet fits the bill, while a space-based asteroid detector is something humanity already tried with WISE (the NEO hunter launched in 2009).

But Sykes contends that NEOCam is a truly unique mission that could help NASA pull off its next planned era of crewed exploration — to near-Earth asteroids — by locating most of the remaining NEOs of interest.

"If we want to send people beyond low-Earth orbit, an asteroid costs much less than the surface of the moon or Mars," Sykes said. "We can identify targets that are quick-turnaround times of weeks or months, to minimize the radiation exposure [in deep space] to astronauts."

In addition, Sykes said, finding perhaps tens of thousands of new NEOs would lay more groundwork for efforts to mine asteroids for precious metals, gather fuel for deep-space exploration, and other novel (and scientific) human endeavors.

Former astronaut Ed Lu, who's also a co-founder of the B612 Foundation — a group dedicated to launching its own NEO-detecting space telescope, called Sentinel — has grown impatient with the delays.

To get an asteroid hunter off the ground, Lu said, NASA needs to try something new, and fast.

"[T]here should be an open competition based on a planetary defense rather than a science requirement, as with the Discovery mission," Lu told Business Insider in an email. "Detecting dangerous asteroids is a concern of national security, not just science."

Blandford, the Stanford physicist, hit this message home in his Space News op-ed.

"[P]lanetary defense is currently treated as a scientific issue, and forced to compete with other science missions," he wrote, "instead of being seen as a long-term imperative for the protection of humanity."

Kelly Dickerson and Paul Szoldra contributed to this post.

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