NASA astronaut candidate Raja Chari climbs into a NASA T-38 aircraft. http://www.nasa.gov/sites/default/files/thumbnails/image/48430853871_50230649e0_k_1.jpg

NASA's Solar Dynamic Observatory, or SDO, was the first mission to be launched for NASA's Living With a Star (LWS) Program, and is designed to understand the causes of solar variability and its impacts on Earth. http://www.nasa.gov/sites/default/files/thumbnails/image/latest_1024_0211.jpg

Our Curiosity rover has come a long way since touching down on Mars seven years ago. It has traveled a total of 13 miles (21 kilometers) and ascended 1,207 feet (368 meters) to its current location. http://www.nasa.gov/sites/default/files/thumbnails/image/pia23346-16.jpg

This new Hubble Space Telescope view of Jupiter, taken on June 27, 2019, reveals the giant planet's trademark Great Red Spot, and a more intense color palette in the clouds swirling in Jupiter's turbulent atmosphere than seen in previous years. http://www.nasa.gov/sites/default/files/thumbnails/image/stsci-h-p1936a-m-1999x2000.png

This galactic duo is known as UGC 2369. The galaxies are interacting, meaning that their mutual gravitational attraction is pulling them closer and closer together and distorting their shapes in the process. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1931a.jpg

The Parker Solar Probe's WISPR instrument saw the solar wind streaming past during the spacecraft's first solar encounter in November 2018. http://www.nasa.gov/sites/default/files/thumbnails/image/parker-solar-probe-view-of-solar-wind-november-2018.png

The crew of the International Space Station snapped this image of a full Moon as the orbiting complex flew 270 miles above the South Pacific Ocean off the coast of South America. http://www.nasa.gov/sites/default/files/thumbnails/image/iss060e013471.jpg

Standing among dead black spruce trees in a burned area near Delta Junction, Richard Chen dug soil sampling pits throughout the burned area. http://www.nasa.gov/sites/default/files/thumbnails/image/img_4349.jpg

On August 13, 2019, NASA astronauts Doug Hurley, left, and Bob Behnken continue to work with teams from NASA and SpaceX to rehearse crew extraction from SpaceX’s Crew Dragon. http://www.nasa.gov/sites/default/files/thumbnails/image/48536461717_7fd6968d5f_k.jpg

Although it looks more like an entity seen through a microscope than a telescope, this rounded object, named NGC 2022, is certainly not algae or tiny, blobby jellyfish. Instead, it is a vast orb of gas in space, cast off by an aging star. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1932a_0.jpg

Today is National Aviation Day and progress is ongoing in the next evolution of air mobility – all thanks to emerging 3D printing technology. http://www.nasa.gov/sites/default/files/thumbnails/image/lrc-2019-h1_p_samjames-062702.jpg

A quick moving storm passes as teams from NASA and SpaceX practice procedures for medical emergency evacuation onboard the GO Searcher ship, Friday, August 15, 2019. http://www.nasa.gov/sites/default/files/thumbnails/image/48558947021_e5bbe7e521_k.jpg

A member of the audience takes a picture with their phone as Vice President Mike Pence is introduced during the sixth meeting of the National Space Council. http://www.nasa.gov/sites/default/files/thumbnails/image/48585166437_a1996c409c_k.jpg

Amazon rainforest fires causing smoke to drift across the whole of Brazil. http://www.nasa.gov/sites/default/files/thumbnails/image/brazil-nolabels.jpg

This Hubble image shows a dark, gloomy scene in the constellation of Gemini (the Twins). The subject of this image confused astronomers when it was first studied — rather than being classified as a single object, it was instead recorded as two objects, owing to its symmetrical lobed structure. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1933a_0.jpg

In 1967, Christine Darden was added to the pool of 'human computers' who wrote complex programs and tediously crunched numbers for engineers at NASA's Langley Research Center. http://www.nasa.gov/sites/default/files/thumbnails/image/christine_darden_0.jpg

West Point graduate, physician and NASA astronaut Andrew Morgan is pictured working outside the International Space Station . http://www.nasa.gov/sites/default/files/thumbnails/image/iss060e043194.jpg

NASA cleared a milestone in preparation for Green Run testing of its Space Launch System (SLS) core stage with the lift and installation of the core stage pathfinder simulator onto the B-2 Test Stand. http://www.nasa.gov/sites/default/files/thumbnails/image/s19-033_ssc-20190824-s00721_pathfinder_lift.jpg

Spitzer Space Telescope into orbit around the Sun on Aug. 25, 2003. Since then, the observatory has been lifting the veil on the wonders of the cosmos, from our own solar system to faraway galaxies, using infrared light. http://www.nasa.gov/sites/default/files/thumbnails/image/1-pia16604-1041.jpg

NGC 5307, a planetary nebula that lies about 10,000 light-years from Earth, can be seen in the constellation Centaurus. http://www.nasa.gov/sites/default/files/thumbnails/image/potw1934a.jpg