Photos of the week: 4/21 - 4/28

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Photos of the week: 4/21 - 4/28
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Photos of the week: 4/21 - 4/28
WASHINGTON, DC - APRIL 27: U.S. first lady Melania Trump attends the Oval Office meeting between U.S. President Donald Trump, President Mauricio Macri of Argentina and the first lady of Argentina, Juliana Awada, April 27, 2017 in Washington, DC. Trump is scheduled to meet with Macri throughout the morning and early afternoon to discuss a range of bilateral issues. (Photo by Win McNamee/Getty Images)
TOPSHOT - Pope Francis has his head covered with his outfit, due to the wind, as he speaks during a weekly general audience at St Peter's square on April 26, 2017 in Vatican. / AFP PHOTO / VINCENZO PINTO (Photo credit should read VINCENZO PINTO/AFP/Getty Images)
SYDNEY, AUSTRALIA - APRIL 25: A young boy looks on as war veterans make their way down Elizabeth Street during the ANZAC Day parade on April 25, 2017 in Sydney, Australia. Australians commemorating 102 years since the Australian and New Zealand Army Corp (ANZAC) landed on the shores of Gallipoli on April 25, 1915, during World War 1. Anzac day is a national holiday in Australia, marked by a dawn service held during the time of the original Gallipoli landing and commemorated with ceremonies and parades throughout the day. (Photo by Brendon Thorne/Getty Images)
TOPSHOT - Anti-fascists clash with police forces as they demonstrate in Paris on April 23, 2017 following the announcement of the results of the first round of the Presidential election. Centrist Emmanuel Macron finished ahead of far-right leader Marine Le Pen on Sunday to qualify alongside her for the runoff in France's presidential election, initial projections suggested. / AFP PHOTO / THOMAS SAMSON (Photo credit should read THOMAS SAMSON/AFP/Getty Images)
A Palestinian protester walks past a fire during clashes with Israeli troops at a protest in support of Palestinian prisoners on hunger strike in Israeli jails, in the West Bank village of Beita, near Nablus April 28, 2017. REUTERS/Mohamad Torokman TPX IMAGES OF THE DAY
Planes from the Indonesian Air Force's Jupiter Aerobatic Team fly near the Prambanan Hindu temple during the Yogyakarta International Air Show in Central Java, Indonesia April 27, 2017 in this photo taken by Antara Foto. Picture taken April 27, 2017. Antara Foto/Hendra Nurdiyansyah/via REUTERSATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. MANDATORY CREDIT. INDONESIA OUT. TPX IMAGES OF THE DAY
U.S. President Donald Trump speaks during a Reuters interview in the Oval Office at the White House in Washington, U.S., April 27, 2017. REUTERS/Carlos Barria TPX IMAGES OF THE DAY
Saturn's atmosphere seen closer than ever before was captured by NASA's Cassini spacecraft during its first Grand Finale dive past the planet on April 26 and released on April 27, 2017. Courtesy NASA/JPL-Caltech/Space Science Institute/Handout via REUTERS 
U.S. Secretary of the Treasury Steven Mnuchin discusses the Trump administration's tax reform proposal in the White House briefing room in Washington, U.S, April 26, 2017. REUTERS/Carlos Barria TPX IMAGES OF THE DAY
Ramu, a pet monkey, jumps as his handler bathes in the waters of the Ganges River, on a hot summer day, in Kolkata, India April 26, 2017. REUTERS/Rupak De Chowdhuri TPX IMAGES OF THE DAY
Britain's Queen Elizabeth stands next to an old subsidised, low cost mobility scooter from the 1960's, during a ceremony in Windsor Castle, Windsor April 25, 2017. REUTERS/Richard Pohle/Pool TPX IMAGES OF THE DAY
A bolt of lightning strikes over harbour cranes in Cape Town, South Africa, April 26, 2017. REUTERS/Mike Hutchings TPX IMAGES OF THE DAY
Farmer Piet Warmerdam picks up a yellow tulip from a red flower field as its growth could damage the rest, in Den Helderin, Netherlands April 22, 2017. Picture taken April 22, 2017. REUTERS/Cris Toala Olivares TPX IMAGES OF THE DAY
A boat sails during the sunset in the sea of Fortaleza, Brazil, April 23, 2017. REUTERS/Paulo Whitaker TPX IMAGES OF THE DAY
Mary Devine of Levittown, Long Island looks on during the Earth Day 'March For Science NYC' demonstration to coincide with similar marches globally in Manhattan, New York, U.S., April 22, 2017. REUTERS/Andrew Kelly TPX IMAGES OF THE DAY
TOYOHASHI, JAPAN - APRIL 27 : Japanese scientists demonstrate a device capable of reading human mind through brainwave detecting electrodes in Toyohashi University of Technology, in Toyohashi of Aichi Prefecture, Japan on April 27, 2017. (Photo by Richard Atrero de Guzman/Anadolu Agency/Getty Images)
RAFAH, GAZA - APRIL 25: Palestinian apiarists keep bees in order to collect their honey at honey filling facility in Tel al-Sultan district of Rafah, Gaza on April 25, 2017. Honey productivity decreases due to lack of medicines used in beekeeplig under Israeli blockade at the Rafah area in Gaza border. (Photo by Mustafa Hassona/Anadolu Agency/Getty Images)
TOPSHOT - Thousands of Venezuelan opposition activists demonstrate against President Nicolas Maduro in Caracas, on April 24, 2017. Protesters rallied on Monday vowing to block Venezuela's main roads to raise pressure on Maduro after three weeks of deadly unrest that have left 21 people dead. Riot police fired rubber bullets and tear gas to break up one of the first rallies in eastern Caracas early Monday while other groups were gathering elsewhere, the opposition said. / AFP PHOTO / Federico PARRA (Photo credit should read FEDERICO PARRA/AFP/Getty Images)
CHICAGO, IL - APRIL 24: Dr Tiffany Brown laughs as she relates her first experience meeting former U.S. President Barack Obama during a forum at the University of Chicago held to promote community organizing on April 24, 2017 in Chicago, Illinois. The visit marks Obama's first formal public appearance since leaving office. (Photo by Scott Olson/Getty Images)
ANKARA, TURKEY - APRIL 23: Turkish President Recep Tayyip Erdogan and Yigit Turk, 10-year-old 4th grade student from Mehmet Akif Primary School who represented the President to mark the National Sovereignty and Children's Day, are seen at the meeting hall of the National Security Council (MGK), at Presidential Complex during the National Sovereignty and Children's Day in Ankara, Turkey on April 23, 2017. (Photo by Kayhan Ozer/Anadolu Agency/Getty Images)
WASHINGTON, DC - APRIL 22: Bill Nye the Science Guy arrives to lead scientists and supporters down Constitution Avenue during the March for Science on April 22, 2017 in Washington, DC. The event is being described as a call to support and safeguard the scientific community. (Photo by Jessica Kourkounis/Getty Images)
BETHESDA, MD - APRIL 22: (AFP OUT) U.S. President Donald Trump (L), with First Lady Melania Trump (R), awards Sergeant First Class Alvaro Barrientos (2-L), with his wife Tammy Barrientos (2-R), the Purple Heart to him during a visit to Walter Reed National Military Medical Center on April 22, 2017 in Bethesda, Maryland. Sergeant First Class Alvaro Barrientos was recently injured in Afghanistan while deployed. (Photo by Shawn Thew - Pool/Getty Images)
Daughter of U.S. President Ivanka Trump attends the W20 Summit under the motto "Inspiring women: scaling up women's entrepreneurship" in Berlin, Germany, April 25, 2017. REUTERS/Hannibal Hanschke
A U.S. Army helicopter crewman mans a gun on the rear gate as it departs Resolute Support headquarters with U.S. Defense Secretary James Mattis aboard in Kabul, Afghanistan April 24, 2017. REUTERS/Jonathan Ernst
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This week, President Trump paid a visit to the Walter Reed Military Medical Center in Maryland to bestow a Purple Heart onto Sergeant First Class Alvaro Barrientos, who was injured in Afghanistan. On Friday, the president met with President Mauricio Macri of Argentina at the White House along with their wives.

People around the world commemorated Earth Day on Saturday, which was marked by the March for Science held in several different cities.

The closest-ever photo of Saturn's atmosphere was also released this week as NASA's Cassini spacecraft made its final pass by the planet.

Take a look through the slideshow above to see photos from all of these stories and more, and be sure to check back next week for our selection of the best photography from the coming seven days.

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