Acquired by the Landsat 7 satellite more than 20 years ago on Sept. 3, 2000, this image is of Greenland's western coast. http://www.nasa.gov/sites/default/files/thumbnails/image/landsat_art_greenland_1920x1200.jpeg

Space Station Commander Akihiko Hoshide of the Japan Aerospace Exploration Agency conducts research using DNA sequencing. http://www.nasa.gov/sites/default/files/thumbnails/image/iss065e369726.jpg

Lucy will be the first space mission to study the Trojan asteroids. http://www.nasa.gov/sites/default/files/thumbnails/image/ta010359_lucy3-b-orbit-crop_0.png

The atmospheric glow blankets the Earth's horizon beneath the stars as the International Space Station orbited 261 miles above the Pacific. http://www.nasa.gov/sites/default/files/thumbnails/image/iss065e334875.jpg

On the night 175 years ago on Sept. 23-24, 1846, astronomers discovered Neptune, the eighth planet orbiting our Sun. http://www.nasa.gov/sites/default/files/thumbnails/image/pia01492-main.jpg

On Monday, Sept. 27, 2021, at 2:12 ET a United Launch Alliance (ULA) Atlas V rocket with the Landsat 9 satellite is slated to lift off on a mission to observe Earth. http://www.nasa.gov/sites/default/files/thumbnails/image/51522053003_dedef32d58_o.jpeg

The engine on United Launch Alliance's Atlas 5 rocket fires to launch the Landsat 9 satellite on a mission to observe Earth on Monday, Sept. 27, 2021. http://www.nasa.gov/sites/default/files/thumbnails/image/51525805040_bf58aac0ae_o.jpeg

Project scientist Mark Clampin is reflected in the flight mirrors of the James Webb Space Telescope during testing at the Marshall Space Flight Center. http://www.nasa.gov/sites/default/files/thumbnails/image/5739767857_b299285ef6_o.jpeg

Pedro Cota is a video producer for NASA en español the agency's Science Mission Directorate. http://www.nasa.gov/sites/default/files/thumbnails/image/img_9392_1.jpg

Before NASA could send humans to space, the agency needed to better understand the effects of prolonged weightlessness on the human body. http://www.nasa.gov/sites/default/files/thumbnails/image/gallaudet_eleven-zero_g_test_edited2.jpg

When it comes time for NASA’s Psyche spacecraft to power itself through deep space, it’ll be more brain than brawn that does the work. http://www.nasa.gov/sites/default/files/thumbnails/image/e-pia24030-side-by-side-thrusters-16.jpg

SpaceX Cargo Dragon resupply ship is pictured as it backs away from the International Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/iss065e434505.jpg

This artist's conception illustrates a Jupiter-like planet alone in the dark of space, floating freely without a parent star. http://www.nasa.gov/sites/default/files/images/549310main_pia14093-43_full.jpg

The seven-member Expedition 65 crew gathered for a portrait inside the International Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/iss065e440627.jpg

This NASA/ESA Hubble Space Telescope image features two interacting galaxies that are so intertwined, they have a collective name – Arp 91. http://www.nasa.gov/sites/default/files/thumbnails/image/potw2140a.jpg

A violent and chaotic-looking mass of gas and dust is seen in this Hubble Space Telescope image of a nearby supernova remnant. http://www.nasa.gov/sites/default/files/images/117227main_image_feature_342_ys_full.jpg

NASA's Lucy mission will explore a record-breaking number of asteroids. http://www.nasa.gov/sites/default/files/thumbnails/image/lucytargetspreview.jpg

With the Lucy spacecraft aboard, a United Launch Alliance Atlas V rocket is seen as it is rolled out of the Vertical Integration Facility. http://www.nasa.gov/sites/default/files/thumbnails/image/51588477876_00484cf555_o.jpeg

Concept for a set of future robots working together to ferry back samples from the surface of Mars collected by the Mars Perseverance rover. http://www.nasa.gov/sites/default/files/thumbnails/image/pia24870.jpeg

​A vivid aurora streams over the Earth as the International Space Station orbited 274 miles above the southern Indian Ocean. http://www.nasa.gov/sites/default/files/thumbnails/image/iss065e473253.jpg