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NASA Earth Observatory1 of 10
Astronauts aboard the International Space Station photographed these striking views of Pavlof Volcano spewing ash and lava on May 18, 2013.
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AP Photo/Brennan Linsley2 of 10Lightning from a thunderstorm strikes amid the wreckage of twisted cars and structures at Plaza Elementary School in Moore, Okla., Thursday, May 23.
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NASA, ESA, and C.R. O'Dell (Vanderbilt University)3 of 10
NASA's Hubble Space Telescope released this view of the Ring Nebula, on May 23, 2013. The new image reveals the nebula's complex structure.
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Interior/Twitter4 of 10US Dept of Interior uploaded this photo to Twitter on May 23, writing, "If you enjoy bird watching, you'll love this photo of swans in flight over Pocosin Lakes National Wildlife Refuge. pic.twitter.com/9WRZYLgwLl"
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Matt Cardy/Getty Images5 of 10Recently hatched cygnets sit with their mother in a nest at Abbotsbury Swannery on May 23, 2013 near Weymouth, England.
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ESO6 of 10This new view of a spectacular stellar nursery IC 2944 was released on May 23, 2013, to celebrate a milestone: 15 years of ESO's Very Large Telescope. The image also shows a group of thick clouds of dust known as the Thackeray globules silhouetted against the pale pink glowing gas of the nebula.
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AP Photo/Charlie Riedel7 of 10
Susan Kates salvages items from a friend's tornado-ravaged home Wednesday, May 22, in Moore, Okla.
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AP Photo/Lionel Cironneau8 of 10Actor Souleymane Deme performs a dance as producer Florence Stern (left), director Mahamat-Saleh Haroun (back center), and actress Anais Monory (right), watch him as they arrive for the screening of Grigris at the 66th international film festival, in Cannes, southern France, Wednesday, May 22.
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AP Photo/Ariel Schalit9 of 10
Metal placards in the shape of Israeli soldiers stand on an old bunker during sunset at an observation point on Mt. Bental in the Israeli controlled Golan Heights, overlooking the border with Syria on Wednesday, May 22.
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AP Photo/Charles Krupa10 of 10Next: Yesterday's Must-See Photos
U.S. Army Pfc. Corey Shelton, of Virginia Beach, Va., uses a wooden stick to drive flags into the grass on Boston Common in advance of Memorial Day weekend in Boston, Wednesday, May 22.