The intertank is the second piece of structural hardware for the massive Space Launch System core stage, built at NASA's Michoud Assembly Facility in New Orleans and delivered to Marshall Space Flight Center for testing. http://www.nasa.gov/sites/default/files/thumbnails/image/msfc-20180306-sls-itunload-1.jpg

Known as the 'Mother of Hubble,' Nancy Grace Roman is shown here at the Yerkes Observatory, University of Chicago in 1948, where she was studying for her doctorate in astronomy. http://www.nasa.gov/sites/default/files/thumbnails/image/ngr_1948_yerkestelescope.jpg

The crew aboard the International Space Station have grown two batches of mixed greens (mizuna, red romaine lettuce and tokyo bekana cabbage), and are now running two Veggie facilities simultaneously. http://www.nasa.gov/sites/default/files/thumbnails/image/iss054e054071_0.jpg

Cassini captured this striking view of Saturn’s moon Dione on July 23, 2012. http://www.nasa.gov/sites/default/files/thumbnails/image/pia17197-1041.jpg

Not everyone gets to become a part of history, but mathematician Billie Robertson is one of the lucky ones. In this image taken on Nov. 27, 1972, she was running a real-time simulation of Translunar Injection (TLI) Go-No-Go for the Apollo 17 lunar landing mission. http://www.nasa.gov/sites/default/files/thumbnails/image/billie_robertson_cropped_0.jpg

Just by determining how circular a given crater is – using pi and the crater’s perimeter and area – planetary geologists can reveal clues about how the crater was formed and the surface that was impacted. http://www.nasa.gov/sites/default/files/thumbnails/image/pia20661_hires.jpg

What's in a name? If your name is Strong Thermal Emission Velocity Enhancement aka STEVE, then there's quite bit behind the name. http://www.nasa.gov/sites/default/files/thumbnails/image/25937026477_4b7949e87d_o.jpg

This image captures a close-up view of a storm with bright cloud tops in the northern hemisphere of Jupiter. http://www.nasa.gov/sites/default/files/thumbnails/image/pia21981.jpg

In late Jan. 2018, NASA’s Global-scale Observations of the Limb and Disk (GOLD) instrument was launched into space aboard a commercial satellite. http://www.nasa.gov/sites/default/files/thumbnails/image/iss054e005626_lrg.jpg

Workers are seen on the launch pad as the Soyuz rocket arrives after being rolled out by train, Monday, March 19, 2018 at the Baikonur Cosmodrome in Kazakhstan. http://www.nasa.gov/sites/default/files/thumbnails/image/27024283098_4f984e095a_o.jpg

The Soyuz MS-08 rocket is launched with Soyuz Commander Oleg Artemyev of Roscosmos and astronauts Ricky Arnold and Drew Feustel of NASA, March 21, 2018, to join the crew of the Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/nhq201803210005.jpg

The Soyuz MS-08 rocket launched Wednesday, March 21, 2018, bringing three new crewmembers to the International Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/40945513351_9a7401c250_o.jpg

An underlying population of infant stars embedded in the nebula NGC 346 are still forming from gravitationally collapsing gas clouds. http://www.nasa.gov/sites/default/files/thumbnails/image/heic0502a.jpg

Claudia Alexander, the project scientist overseeing NASA's support role in the European Space Agency's Rosetta mission, stands on the view deck of mission control at the Jet Propulsion Laboratory. http://www.nasa.gov/sites/default/files/thumbnails/image/la-sci-c1-1110-rosetta-alexander-pictures-015_1.jpg

This mosaic, taken by the Mars Curiosity rover, looks uphill at Mount Sharp. http://www.nasa.gov/sites/default/files/thumbnails/image/pia22313.jpg

TESS, the Transiting Exoplanet Survey Satellite, is the next step in the search for planets outside of our solar system, including those that could support life. http://www.nasa.gov/sites/default/files/thumbnails/image/tess_with_techs_4000.jpg

Inside the Astrotech processing facility at Vandenberg Air Force Base, NASA's Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, Mars lander is tested ahead of its scheduled launch on May 5, 2018. http://www.nasa.gov/sites/default/files/thumbnails/image/insight.jpg

Before there were computers and software that could stitch together digital images, they were printed on photo paper, trimmed by hand, and taped in place on a large black board. http://www.nasa.gov/sites/default/files/thumbnails/image/29177231106_5186f7024e_o.jpg

NASA astronaut Drew Feustel seemingly hangs off the International Space Station while conducting a spacewalk on March 29, 2018. http://www.nasa.gov/sites/default/files/thumbnails/image/iss055e006321.jpg

Aeronautical innovations are part of a government-industry partnership to collect data that could make supersonic flight over land possible, dramatically reducing travel time in the United States. http://www.nasa.gov/sites/default/files/thumbnails/image/lbfd-vehicle2.jpg