Appearing as strings of orange dots, the brightest sets of dots belong to asteroids Klotho and Lina. Both orbit out in the main asteroid belt between Mars and Jupiter. http://www.nasa.gov/sites/default/files/thumbnails/image/pia23589.jpg

This 2010 image from the Herschel Space Observatory shows dust clouds associated with the Rosette Nebula, a stellar nursery about 5,000 light-years from Earth in the Monoceros, or Unicorn, constellation. http://www.nasa.gov/sites/default/files/thumbnails/image/rosette_herschel_hi.jpg

This remarkable spiral galaxy, known as NGC 4651, may look serene and peaceful as it swirls in the vast, silent emptiness of space, but don’t be fooled — it keeps a violent secret. http://www.nasa.gov/sites/default/files/thumbnails/image/potw2013a.jpg

In this Hubble Space Telescope image, researchers has revisited one of Hubble's most iconic and popular images: the Eagle Nebula’s Pillars of Creation. http://www.nasa.gov/sites/default/files/thumbnails/image/heic1501b_0.jpg

Aboard the International Space Station, NASA astronaut Jessica Meir conducts cardiac research inside the Life Sciences Glovebox. http://www.nasa.gov/sites/default/files/thumbnails/image/iss062e115355_0.jpg

The X-59 Quiet SuperSonic Technology, or QueSST, wing assembly is lifted by a crane and moved to another area of the manufacturing floor in preparation for wing skin installation. http://www.nasa.gov/sites/default/files/thumbnails/image/p19-325-010.jpg

The Soyuz MS-16 lifts off from Site 31 at the Baikonur Cosmodrome in Kazakhstan on Thursday, April 9, 2020. http://www.nasa.gov/sites/default/files/thumbnails/image/shl_5284.jpg

Apollo 13 launched on April 11, 1970, on a journey to become the third crew to land on the Moon. The crew never made it. http://www.nasa.gov/sites/default/files/thumbnails/image/s70-31774_orig.jpg

This image shows sample site Nightingale Crater, OSIRIS-REx’s primary sample collection site on asteroid Bennu. http://www.nasa.gov/sites/default/files/thumbnails/image/nightingale_1.png

This artist's illustration shows what Kepler-1649c could look like from its surface. http://www.nasa.gov/sites/default/files/thumbnails/image/product_2.jpg

NASA astronaut Jessica Meir gives a thumbs up after she, Roscosmos cosmonaut Oleg Skripochka and NASA astronaut Andrew Morgan landed in their Soyuz MS-15. http://www.nasa.gov/sites/default/files/thumbnails/image/49784308837_e185aab93a_k.jpg

Fifty years ago, on April 22, 1970, people around the world marked the first Earth Day. http://www.nasa.gov/sites/default/files/thumbnails/image/as17-148-22727_lrg_0.jpg

This image shows a small portion of the Gulf Stream off of South Carolina as it appeared in infrared data collected by the Landsat 8 satellite in April 2013. http://www.nasa.gov/sites/default/files/thumbnails/image/gulfstream_tir_2013099_lrg.jpg

This image is one of several global images of the Earth at night released in 2017. http://www.nasa.gov/sites/default/files/thumbnails/image/blackmarble_2016_americas_composite.png

On the northwestern coast of Madagascar, the salty waters of the Mozambique Channel penetrate inland to join with the freshwater outflow of the Betsiboka River, forming Bombetoka Bay. http://www.nasa.gov/sites/default/files/thumbnails/image/bombetoka_aster_23aug00_lrg.jpg

The Susquehanna River cuts through the folds of the Valley-and-Ridge province of the Appalachian Mountains in this photograph taken by the crew of the International Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/iss061e098033_lrg.jpg

On Friday, April 24, 2020, NASA Administrator Jim Bridenstine visited the White House to brief President Trump on NASA's fight to alleviate COVID-19. http://www.nasa.gov/sites/default/files/thumbnails/image/p20200424sc-1048.jpg

On April 25, 1990, the Hubble Space Telescope was deployed from the cargo bay of space shuttle Discovery. http://www.nasa.gov/sites/default/files/thumbnails/image/s31-03-009.jpg

The Mars Helicopter, a small, autonomous rotorcraft, will travel with NASA's Mars Perseverance rover, currently scheduled to launch in July 2020. http://www.nasa.gov/sites/default/files/thumbnails/image/helicopter20180511_0.jpg

Dark matter, although invisible, makes up most of the universe’s mass and creates its underlying structure. http://www.nasa.gov/sites/default/files/thumbnails/image/macs_j1149-2223.jpg