NASA’s new three-dimensional portrait of methane concentrations shows the world’s second largest contributor to greenhouse warming. http://www.nasa.gov/sites/default/files/thumbnails/image/fullglobe_asia_nobar.jpg

This photograph shows ripples in the surface of Denman Glacier in East Antarctica that throw shadows against the ice. http://www.nasa.gov/sites/default/files/thumbnails/image/denman20200325-nasa.jpg

Located about 21 million light-years from our galaxy in the constellation Canes Venatici, NGC 4618 has a diameter of about one-third that of our Milky Way. Together with its neighbor, NGC 4625, it forms an interacting galaxy pair, which means that the two galaxies are close enough to influence each other gravitationally. http://www.nasa.gov/sites/default/files/thumbnails/image/potw2012a.jpg

Today is National Doctors' Day! http://www.nasa.gov/sites/default/files/thumbnails/image/1472px-mae-jemison_1.jpg

In March 2017, Peggy Whitson broke the then-spacewalking record for female astronauts. http://www.nasa.gov/sites/default/files/thumbnails/image/iss050e028908_0.jpg

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