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

A team of NASA scientists and engineers is poised to realize a lifetime goal: building an instrument powerful and accurate enough to gather around-the-clock global atmospheric carbon-dioxide (CO2) measurements from space. Developers of the CO2 Sounder Lidar instrument snapped this photo during a field campaign over California and Nevada. via NASA http://ift.tt/2ax2BeL

Acadia National Park is one of the most visited parks in America, drawing more than 2.5 million visitors per year to the craggy, jagged coast of Maine. The park is celebrating its 100th anniversary in 2016. On September 6, 2015, the Operational Land Imager (OLI) on the Landsat 8 satellite acquired these images of the park and its surroundings. via NASA http://ift.tt/2aJKh6Q

On July 21, 2016, Expedition 48 Commander Jeff Williams of NASA shared this photograph of sunglint illuminating the waters of the Chesapeake Bay, writing, “Morning passing over the Chesapeake Bay heading across the Atlantic.” via NASA http://ift.tt/2ahQO9n

The blue dots in this field of galaxies, known as the COSMOS field, show galaxies that contain supermassive black holes emitting high-energy X-rays. via NASA http://ift.tt/2aB7Ifz