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EarthSky

Going to the beach? Watch this video

Rip currents – sometimes called by the misnomer rip tide – flow outward from beaches, sometimes faster than humans can swim. Here’s what to do if you get caught in one.

What exactly is twilight?

Sure, twilight is that magical time of day that lies between daylight and darkness. Astronomers, the experts on nighttime, recognize 3 twilights.

Moon near Crown of Scorpion on June 7

The moon on June 7, 2017 is near the upper part of the constellation Scorpius, aka the Scorpion’s Crown. Bright red Antares and golden Saturn are also nearby.

How hard did it rain on Mars?

In a new study, geologists show there was rainfall on Mars in the past – and that it was heavy enough to carve out many of the features we see today on the planet’s surface.

Saturn’s moon may have tipped over

Scientists used Cassini spacecraft images to show that Saturn’s moon Enceladus may have tipped away from its original spin axis by 55 degrees – more than halfway toward rolling completely onto its side.

Born in June? Here’s your birthstone

Happy birthday June babies! Your month has 3 birthstones – pearl, moonstone, and Alexandrite.

Deneb, tail of Cygnus the Swan

Deneb marks the Tail of Cynus the Swan … and the head of a crosslike pattern known as the Northern Cross.

NASA camera views sunglint from Earth

You’d expect sunglint from an ocean or other body of water. But the camera caught some glints over land as well. A new NASA video explains how scientists solved the mystery.

Lake Baikal: Earth’s deepest, oldest lake

Controversy surrounds construction of hydropower stations on a river that feeds deep, ancient Lake Baikal.

What are the full moon names?

Lists of common full moon names – both by month and by season – for both the Northern and Southern Hemispheres.