"The temperature just wildly swings from extremely hot to extremely cold," John Monnier, a professor of astronomy at the ...

Don Pettit is on a roll. Just days after sharing a breathtaking shot of Earth, the American astronaut has followed up with an equally stunning shot of a waning crescent moon, or, as Pettit put it: “a ...

NASA's Juno spacecraft made a close flyby of Jupiter moon lo. See an animation of the images the probe captured created by Koji Kuramura and Gerald Eichstädt. Credit: NASA/JPL-Caltech/SwRI/MSSS | ...