On Aug. 24, 2016, Station Commander Jeff Williams passed astronaut Scott Kelly, also a former station commander, for most cumulative days living and working in space by a NASA astronaut (520 days and counting). Williams is scheduled to land Sept. 6, 2016, for a record total of 534 days in space. via NASA http://ift.tt/2bnkEWE

Expedition 48 Commander Jeff Williams (shown here) and Flight Engineer Kate Rubins of NASA successfully installed the first of two international docking adapters Friday Aug. 19, 2016, during a five hour and 58-minute spacewalk. On Sept. 1, the two astronauts will spacewalk outside the space station for the second time in less than two weeks. via NASA http://ift.tt/2bcild3

Dione reveals its past via contrasts in this view from NASA’s Cassini spacecraft. via NASA http://ift.tt/2bpUFzx

As NASA celebrates National Aviation Day, the agency’s innovators are working to transform air transportation to meet the future needs of the global aviation community. The agency is embarking on a 10-year plan, New Aviation Horizons, that will see NASA field a number of experimental aircraft to demonstrate 21st century ideas for flight. via NASA http://ift.tt/2bjfrkf

Welders inside a large liquid hydrogen tank for NASA’s Space Launch System at the Michoud Assembly Facility in New Orleans are plugging holes left after the tank was assembled. via NASA http://ift.tt/2b3ycaU

A new look at the debris from an exploded star in our galaxy has astronomers re-examining when the supernova actually happened. via NASA http://ift.tt/2aZURrp

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