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In 1572, Danish astronomer Tycho Brahe was among those who noticed a new bright object in the constellation Cassiopeia.



NASA astronaut Christina Koch works while tethered near the Port 6 truss segment of the International Space Station.



Amy Ross, a spacesuit engineer at Johnson Space Center, NASA Administrator Jim Bridenstine, watch as Kristine Davis and Dustin Gohmert wear prototype spacesuits.



NASA astronaut Dr. Serena Auñón-Chancellor speaks about her experience on Expeditions 56 and 57 onboard the International Space Station (ISS) at Excel Academy Public Charter School, Monday, June 10, 2019.



NASA’s X-59 QueSST, an experimental piloted aircraft designed to fly faster than sound without producing the annoying – if not alarming – sonic booms of previous supersonic aircraft is taking shape..



NASA’s X-59 QueSST, an experimental piloted aircraft designed to fly faster than sound without producing the annoying – if not alarming – sonic booms of previous supersonic aircraft is taking shape..



Spitzer Space Telescope's infrared cameras penetrate much of the dust, revealing the stars of the crowded galactic center region of our Milky Way.



Discovered in 2018 by NASA's Transiting Exoplanet Satellite Survey (TESS) mission, planet LHS 3844b is located 48.6 light-years from Earth and has a radius 1.3 times that of Earth.



After completing the first of 10 spacewalks to upgrade the station, astronaut Christina Koch, wrote: The great @Space_Station battery swap series of spacewalks is underway!



Cosmologist Stephen Hawking changed our view of the universe with his remarkable theories and outreach even thought he suffered from ALS, which slowly paralyzed him over the years.



NASA astronaut Nick Hague is seen outside the Soyuz MS-12 spacecraft after he landed in a remote area near the town of Zhezkazgan, Kazakhstan.



NASA's Pegasus Barge arrives at the Launch Complex 39 turn basin wharf at Kennedy Space Center in Florida to make its first delivery to Kennedy in support of the agency's Artemis missions.



Today is my last Monday living on this orbiting laboratory and I’m soaking up my final views, said astronat Nivk Hague.



Expedition 60 astronaut Christina Koch photographed the Soyuz MS-15 crew ship ascending into space after its launch from Kazakhstan.



Frank Rubio was selected by NASA to join the 2017 Astronaut Candidate Class and reported for duty in August 2017.



In this image, a galaxy called ESO 243-49 is home to an extremely bright object called HLX-1. Circled in this image, HLX-1 is the most likely example of a black hole in the intermediate mass range that scientists have found.



Tethys appears to be stuck to Saturn's A and F rings from this perspective.



The gantry arms close around the Soyuz rocket after it was raised into vertical position on the launch pad, Monday, Sept. 23, 2019 at the Baikonur Cosmodrome in Kazakhstan.



Because they lack stellar nurseries and contain mostly old stars, elliptical galaxies — Like Messier 110 — are often considered “dead” when compared to their spiral relatives. But scientists have spotted signs of a population of young, blue stars at Messier 110's center, hinting that this neighbor of our Milky Way may not be so “dead” after all.



This image shows sedimentary rock and sand within Danielson Crater, an impact crater about 42 miles or 67 kilometers in diameter, located in the southwest Arabia Terra region of Mars.