When light from the sun or the moon travels through more atmosphere to your eyes, you see oddly shaped suns or moons in interesting and beautiful ways.
A geomagnetic storm is a disturbance in Earth's magnetic field, caused by activity on the sun. The current solar cycle number 25 has triggered a few of them.
Snowball Earth might have been more of a slushball, scientists say. More temperate regions with pockets of slushy waters would have allowed life to survive.
See 13 volcanoes from space in this new video from the European Space Agency. Plus, learn about the recently active volcanoes on the Kamchatka Peninsula.
A massive seaweed bloom of sargassum in the Atlantic Ocean is headed toward the Caribbean and east coast of Florida. Some locals are already seeing it.