Sang Choi has worked for NASA for nearly 40 years. Since beginning work at the Langley Research Center in October 1980, Choi has received 71 awards from the agency. http://www.nasa.gov/sites/default/files/thumbnails/image/sang_choi_larc_0.jpg

It's Teacher Appreciation Week and teachers and space travel go hand-in-hand. http://www.nasa.gov/sites/default/files/thumbnails/image/26788065189_b9244802f1_k.jpg

This composite of the Crab Nebula was made with data from the Chandra X-Ray Observatory (blue and white), Hubble Space Telescope (purple), and Spitzer Space Telescope (pink). http://www.nasa.gov/sites/default/files/thumbnails/image/crab_lg.jpg

Blooming roses at the Armstrong Flight Research Center highlighting the Bell X-IE aircraft. http://www.nasa.gov/sites/default/files/thumbnails/image/95798098_10217556926263413_8433257139979419648_o.jpg

Several hundred million years ago, two galaxy clusters collided and then passed through each other. http://www.nasa.gov/sites/default/files/thumbnails/image/a2384_lg.jpg

Iowa native astronaut Raja Chari was selected by NASA to join the 2017 Astronaut Candidate Class. http://www.nasa.gov/sites/default/files/thumbnails/image/48430990887_1b1b7ed422_o.jpg

Northrup Grumman's Cygnus resupply ship is pictured in the grips of the Canadarm2 robotic arm moments before its release ending its 83-day stay at the International Space Station on May 11, 2020. http://www.nasa.gov/sites/default/files/thumbnails/image/iss063e010616.jpg

NASA's Juno mission captured this look at Jupiter's tumultuous northern regions during the spacecraft's close approach to the planet on Feb. 17, 2020. http://www.nasa.gov/sites/default/files/thumbnails/image/pia23802_0.jpg

Nancy Grace Roman (1925-2018), NASA's first chief astronomer, is known as the 'Mother of Hubble.' http://www.nasa.gov/sites/default/files/thumbnails/image/44477663304_a673c66226_o.jpg

The crew of the International Space Station snapped this image of this typhoon in the South Pacific Ocean on May 13, 2020. http://www.nasa.gov/sites/default/files/thumbnails/image/iss063e012660.jpg

Chemist Audrey Miyamoto preparing an Apollo lunar sample to analyze for amino acids at NASA’s Ames Research Center. http://www.nasa.gov/sites/default/files/thumbnails/image/a-42500-12_2.jpg

Annie and John Glenn arrive at the Mission Control Center for the Gemini IV launch on June 4, 1965. John Glenn was the first American to orbit the Earth. http://www.nasa.gov/sites/default/files/thumbnails/image/s65-29442.jpg

NASA astronauts Robert Behnken, left, and Douglas Hurley listen as NASA Administrator Jim Bridenstine gives remarks after the crew arrived at the Launch and Landing Facility at Kennedy Space Center. http://www.nasa.gov/sites/default/files/thumbnails/image/49917936962_169a619522_k.jpg

A SpaceX Falcon 9 rocket with the company's Crew Dragon spacecraft onboard is seen as it is rolled out of the horizontal integration facility at Launch Complex 39A as preparations continue for the Demo-2 mission. http://www.nasa.gov/sites/default/files/thumbnails/image/nhq202005210003.jpg

In this iconic image, Staion Commander Leroy Chiao of NASA watches a water bubble float between him and the camera. http://www.nasa.gov/sites/default/files/thumbnails/image/iss010e13569.jpg

A SpaceX Falcon 9 rocket with the company's Crew Dragon spacecraft onboard is seen on the launch pad at Launch Complex 39A at sunrise as preparations continue for the Demo-2 mission, Wednesday, May 27, 2020. http://www.nasa.gov/sites/default/files/thumbnails/image/nhq202005270001_0.jpg

This artist's concept shows exoplanet Kepler-1649c orbiting around its host red dwarf star. http://www.nasa.gov/sites/default/files/thumbnails/image/pia23689.jpg

The brilliant tapestry of young stars flaring to life resembles a glittering fireworks display in this Hubble Space Telescope image. http://www.nasa.gov/sites/default/files/thumbnails/image/location-smaller.png

A SpaceX Falcon 9 rocket with the company's Crew Dragon spacecraft onboard is seen illuminated on the launch pad at Launch Complex 39A as preparations continue for NASA’s SpaceX Demo-2 mission, Saturday, May 30, 2020. http://www.nasa.gov/sites/default/files/thumbnails/image/49951173438_f878865d38_k.jpg

SpaceX Falcon 9 rocket lifted off carrying the company's Crew Dragon spacecraft on NASA’s SpaceX Demo-2 mission with NASA astronauts Robert Behnken and Douglas Hurley onboard, Saturday, May 30, 2020. http://www.nasa.gov/sites/default/files/thumbnails/image/nhq202005300015.jpg