Astronaut Scott Kelly posted this photo, taken from the International Space Station during his year-long space mission, to social media on July 19, 2015, with the caption, "Day 114. #Moon #Venus ...

NASA makes us proud to be Americans. And even more so, the agency is an engine of discovery and innovation that benefits all ...

Mark and Scott Kelly, twin brothers and former NASA astronauts, spoke to "CBS Mornings" about how the agency is set to lose ...