European mission to Mercury just made its sixth flyby of the planet, revealing stunning close-ups of the permanently shadowed craters at Mercury's north pole.

On Christmas Day 2022, a rare and remarkable aurora lit up the Arctic sky, stunning observers and puzzling scientists. Unlike ...

Mercury is a little brighter than the stars. So you want to be able to see this arc of three "stars." One of them's a planet. Then the crescent moon is going to pop up tomorrow night.

Over the past two centuries, the construction of thousands of dams has done more than just tame rivers – it has shifted the ...