This photo was among the first images taken by the Atmospheric Imaging Assembly on NASA's Solar Dynamics Observatory satellite.

Australian National University astrophysicist Brian Schmidt chose this Hubble photo of Supernova SN 1994D as his favorite space image, which he called "the poster child of a type Ia supernovae."

This photo shows helmets and spacesuits covered in lunar dust after the last manned moonwalk, from the 1972 Apollo 17 mission.

The crescent planet Neptune and its crescent moon Triton, as seen by NASA's Voyager 2 spacecraft in 1989.

"Earthrise," the first picture taken of planet Earth by people orbiting the moon. This shot was captured by Apollo 8 astronaut Bill Anders on December 24, 1968, as his spacecraft became the first to fly around the moon.

This photo, called "Earth From Mars," was taken by NASA's Mars Exploration Rover Spirit on March 8, 2004. It was the first image of Earth seen from the surface of a planet beyond the moon.

This seminal 1995 image was taken by the Hubble Space Telescope. Called the Hubble Deep Field, it collected light over many hours to reveal the deepest view of the universe yet, which included thousands of distant galaxies.

This undated photo shows a classic type 1a supernova remnant. Researchers Saul Perlmutter and Adam Riess of the United States and US-Australian Brian Schmidt won the 2011 Nobel Physics Prize on October 4, 2011 for their research on supernovae.

The silhouette of the space shuttle Endeavour appears over Earth's colorful horizon in this image photographed by an Expedition 22 crew member on Feb. 9, 2010.

"These tidal tails are thin, elongated streams of gas, dust and stars that extend away from a galaxy into space. They occur when galaxies gravitationally interact with one another, and material is sheared from the outer edges of each body and flung out into space in opposite directions, forming two tails. They almost always appear curved, so when they are seen to be relatively straight, as in this image, it is clear that we are viewing the galaxies side-on."

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