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

Saturn’s hexagonal polar jet stream is the shining feature of almost every view of the north polar region of Saturn. via NASA http://ift.tt/2prpfwB

This 360-degree mosaic from the Mast Camera (Mastcam) on NASA’s Curiosity Mars rover looks out over a portion of the Bagnold Dunes, which stretch for several miles. via NASA http://ift.tt/2p4yfvJ

This illustration shows a hypothetical planet covered in water around the binary star system of Kepler-35A and B. With two suns in its sky, Luke Skywalker’s home planet Tatooine in “Star Wars” looks like a parched, sandy desert world. In real life, we know that two-star systems can indeed support planets. via NASA http://ift.tt/2p9yXmD

In the north, Enceladus’ surface appears to be about as old as any in the solar system. The south, however, is an entirely different story. via NASA http://ift.tt/2p5HPcO

Machining for NASA’s Orion spacecraft, scheduled to fly on the second integrated flight with agency’s Space Launch System rocket, is well underway at Ingersoll Machine Tools in Rockford, Illinois. The new deep space spacecraft will take humans farther into the solar system than we have ever traveled before. via NASA http://ift.tt/2qANEQE

Areas near the equator are frequently cloudy, obscuring the view of Earth’s surface from space. April 7, 2017, was no different. On that day, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this natural-color image of clouds over the Gilbert Islands. via NASA http://ift.tt/2oYkeLf

A engine section structural qualification test article for NASA’s new rocket, the Space Launch System, is loaded onto the barge Pegasus at the agency’s Michoud Assembly Facility in New Orleans. The test article now will make its way from Michoud to NASA’s Marshall Space Flight Center in Huntsville, Alabama, for structural loads testing. via NASA http://ift.tt/2qc60YS