The low angle of sunlight along the slim crescent of Saturn’s moon Enceladus. via NASA http://ift.tt/2rL511T

A pair of CubeSats, with the Earth’s limb in the background, moments after being ejected from a small satellite deployer outside of the International Space Station’s Kibo laboratory module on Wednesday, May 16, 2017. Over a dozen CubeSats were ejected into Earth orbit this week to study Earth and space phenomena for the next one to two years. via NASA http://ift.tt/2qBi60p

A view of Earth from 36,000 nautical miles away as photographed from the Apollo 10 spacecraft during its trans-lunar journey toward the moon. While the Yucatan Peninsula is obscured by clouds, nearly all of Mexico north of the Isthmus of Tehuantepec can be clearly delineated. via NASA http://ift.tt/2rv852x

A fjord in southern Greenland, as seen during Operation IceBridge’s last flight of the 2017 Arctic campaign, on May 12, 2017. This final full science flight, ICESat-2 South, was designed along the ground tracks of NASA’s upcoming ICESat-2, to fill in a gap in altimetry coverage of central southern Greenland. via NASA http://ift.tt/2qRUipN

The towering primary mirror of NASA’s James Webb Space Telescope stands inside a cleanroom at NASA’s Johnson Space Center in Houston, where it will undergo its last cryogenic test before it is launched into space in 2018. In preparation for testing, the “wings” of the mirror (which consist of the three segments on each side) were spread open. via NASA http://ift.tt/2qNH25o

The projection of Saturn’s shadow on the rings grows shorter as Saturn’s season advances toward northern summer. via NASA http://ift.tt/2r8XD3z

Nearly 50 student teams from middle and high schools, colleges and universities in 22 states demonstrated advanced rocketry and engineering skills in NASA’s 2017 Student Launch challenge. Teams spent eight months building and testing rockets designed to fly to an altitude of one mile, deploy an automated parachute system, and safely land for reuse. via NASA http://ift.tt/2pGdcek

Expedition 51 Flight Engineer Jack Fischer of NASA is seen inside the International Space Station in his spacesuit during a fit check, in preparation for a spacewalk on Friday, May 12, 2017. This will be the 200th spacewalk at the station for assembly and maintenance, the ninth spacewalk for NASA astronaut Peggy Whitson and the first for Fischer. via NASA http://ift.tt/2qwu8ZK

This composite image of the Crab Nebula, a supernova remnant, was assembled by combining data from five telescopes spanning nearly the entire breadth of the electromagnetic spectrum: the Karl G. Jansky Very Large Array, the Spitzer Space Telescope, the Hubble Space Telescope, the XMM-Newton Observatory, and the Chandra X-ray Observatory. via NASA http://ift.tt/2q3p0uT

The shadow of NASA’s P-3 aircraft is seen over an iceberg on a May 8, 2017 flight supporting NASA’s Operation IceBridge mission. IceBridge began its final week of Arctic Spring 2017 surveys with a glacier-packed mission in Greenland, called Southeast Glaciers 01. via NASA http://ift.tt/2pgWHtL