The remotely controlled Sally Ride EarthKAM aboard the International Space Station acquired this photograph on July 14, 2016, as the orbiting laboratory flew over Lake Powell and the border of Utah and Arizona. Located on the Colorado River, Lake Powell is the second largest artificial reservoir in the United States. via NASA http://ift.tt/2bfc1Mp

Expedition 48 crew members Kate Rubins (left) and Jeff Williams (right) of NASA outfit spacesuits inside of the Quest airlock aboard the International Space Station. Rubins and Williams will conduct a spacewalk on Friday, Aug. 19, 2016, to install a new docking port that will enable the future arrival of U.S. commercial crew spacecraft. via NASA http://ift.tt/2bsR1DP

In this 30 second exposure, a meteor streaks across the sky during the annual Perseid meteor shower Friday, Aug. 12, 2016 in Spruce Knob, West Virginia. via NASA http://ift.tt/2aMxaNq

The Multi-angle Imaging SpectroRadiometer (MISR) instrument aboard NASA’s Terra satellite passed directly over Rio de Janeiro on Aug. 2, 2016, just prior to the opening of the Summer Olympic Games. On the left is an image from MISR’s nadir camera; on the right, a map of aerosol optical depth. via NASA http://ift.tt/2b8hQMb

Two cosmic structures show evidence for a remarkable change in behavior of a supermassive black hole in a distant galaxy. via NASA http://ift.tt/2b8yFuc

This false-color view from NASA’s Cassini spacecraft shows clouds in Saturn’s northern hemisphere. The view was made using images taken by Cassini’s wide-angle camera on July 20, 2016, using a combination of spectral filters sensitive to infrared light at 750, 727 and 619 nanometers. via NASA http://ift.tt/2b5OdPE

An astronaut aboard the International Space Station adjusted the camera for night imaging and captured the green veils and curtains of an aurora that spanned thousands of kilometers over Quebec, Canada. via NASA http://ift.tt/2aLT32y

Neil A. Armstrong is photographed in the cockpit of the Ames Bell X-14 aircraft at NASA’s Ames Research Center. Armstrong, the first man to walk on the moon, was born in Wapakoneta, Ohio, on August 5, 1930. via NASA http://ift.tt/2aAr5q7

NASA’s Curiosity Mars rover began close-up investigation of a target called “Marimba,” on lower Mount Sharp, during the week preceding the fourth anniversary of the mission’s dramatic sky-crane landing. via NASA http://ift.tt/2awWxlG

Engineers and astronauts conducted testing in a representative model of the Orion spacecraft at NASA’s Johnson Space Center in Houston to gather the crew’s feedback on the design of the docking hatch and on post-landing equipment operations. via NASA http://ift.tt/2asGUOr