American astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko mark the halfway point of on Tuesday, Sept. 15. The year-long literal trip around the world will study the physical and mental effects of sustained time in space. Kelly's identical twin, retired astronaut Mark Kelly, is also being examined as part of the research to determine the subtle impact of space flight on individuals with the same genetics. On Monday, Sept. 14, Scott Kelly said during a NASA press conference that...

It’s not everyday that you look up to see a perfect halo shimmering across the sky. The optical phenomenon known as a parhelic circle was spotted over the skies of South Salem, New York, earlier this week, and Facebook fan Ernie LaMadeleine sent us the video. “The parhelic circle phenomenon happens when millions of ice crystals mirror the sun, forming a circular structure in the sky," said weather.com meteorologist Quincy Vagell. "Typically, only fragments of the circle are visible making...

One of the biggest space stories of the summer was the images we saw of the dwarf planet Pluto, which was finally photographed from up-close by NASA's New Horizons spacecraft. Those images are still rolling in, and as they make the long journey back to Earth, NASA has been releasing them to the public little by little. One such photograph, , showed clear details of the complexities of a mountain range known as theTartarus Dorsa. In the image below, the...