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"The Enchanted Islands of #Ecuador – the Galápagos," were photographed by NASA astronaut Ricky Arnold from aboard the International Space Station.


 
This colorful image, taken by NASA’s Hubble Space Telescope, celebrates the Earth-orbiting observatory’s 28th anniversary of viewing the heavens, giving us a window seat to the universe’s extraordinary stellar tapestry of birth and destruction.


 
The Colorado High-resolution Echelle Stellar Spectrograph, or CHESS 4, was successfully launched on a NASA Black Brant IX sounding rocket at 12:47 p.m. EDT, April 16 (4:47 a.m. local, April 17) from the Kwajalein Atoll in The Republic of the Marshall Islands.


 
Astronauts aboard the International Space Station captured this photo while flying over the western United States. The wide field of view stretches from the Sierra Nevada of California to the Columbia Plateau of Oregon and the Snake River Valley of Idaho. Lake Tahoe is nestled on the border of California and Nevada.


 
The worlds orbiting other stars are called “exoplanets,” and they come in a wide variety of sizes, from gas giants larger than Jupiter to small, rocky planets about as big around as Earth or Mars. This rocky super-Earth is an illustration of the type of planets future telescopes, like NASA's TESS, hope to find outside our solar system.


 
Auroras are one of the many Earthly phenomena the crew of the International Space Station observe from their perch high above the planet.


 
From March 20-23, 2018, the Solar Dynamics Observatory captured a series of images of our Sun and then ran together three sequences in three different extreme ultraviolet wavelengths.


 
Attendees talk with NASA staff at exhibit booths during Sneak Peek Friday at the USA Science and Engineering Festival, Friday, April 6, 2018. At the festival, NASA showcased the future of human space exploration – including the Orion spacecraft and the Space Launch System rocket.


 
These graceful arcs are a cosmic phenomenon known as an Einstein ring - created as the light from distant galaxies warps around an extremely large mass, like a galaxy cluster.


 
Gullies on Martian sand dunes, like these in Matara Crater, have been very active, with many flows in the last ten years.


 
We honor the legacy of Dr. Martin Luther King Jr., who was assassinated fifty years ago in Memphis, Tennessee. This image taken from the International Space Station shows a detailed view of the city of Memphis from low-Earth orbit.


 
Aeronautical innovations are part of a government-industry partnership to collect data that could make supersonic flight over land possible, dramatically reducing travel time in the United States.


 
NASA astronaut Drew Feustel seemingly hangs off the International Space Station while conducting a spacewalk on March 29, 2018.


 
Before there were computers and software that could stitch together digital images, they were printed on photo paper, trimmed by hand, and taped in place on a large black board.


 
Inside the Astrotech processing facility at Vandenberg Air Force Base, NASA's Interior Exploration using Seismic Investigations, Geodesy and Heat Transport, or InSight, Mars lander is tested ahead of its scheduled launch on May 5, 2018.


 
TESS, the Transiting Exoplanet Survey Satellite, is the next step in the search for planets outside of our solar system, including those that could support life.


 
This mosaic, taken by the Mars Curiosity rover, looks uphill at Mount Sharp.


 
Claudia Alexander, the project scientist overseeing NASA's support role in the European Space Agency's Rosetta mission, stands on the view deck of mission control at the Jet Propulsion Laboratory.


 
An underlying population of infant stars embedded in the nebula NGC 346 are still forming from gravitationally collapsing gas clouds.


 
The Soyuz MS-08 rocket launched Wednesday, March 21, 2018, bringing three new crewmembers to the International Space Station.