Up? NASA astronaut Nichole Ayers has shared an incredible image of a sprite, a rare weather phenomenon that's triggered high above the clouds by "intense electrical activity in the thunderstorms below ...

Discover why Earth's farthest distance from the sun coincides with summer heat, then grab your binoculars for a week of ...

Currently onboard the ISS as part of Expedition 73, Ayers and her fellow crew members are tasked with a number of scientific ...