Video: Are we loving manatees to death?

Manatee season at the Crystal River National Wildlife Refuge in Florida is November 1 to March 31. You can almost imagine the manatees breathing a sigh of relief.

Video: Big Bang breakthrough explained with a towel and an apple

Two-minute video explanation of this week's announcement about gravitational waves and the Big Bag - using a towel, an apple and a ping pong ball.

Night scene from Kvænangsfjellet in Norway

A spring color palette, and yet ... so chilly.

Some perspective on winter 2014

U.S. winter of 2013-14 was only 1°F below average, but it followed two warmer-than-average winters. Did that fact make this winter seem colder than it was?

Death of a snowflake

On the first day of spring for us in the Northern Hemisphere, check out this series taken yesterday of a snowflake, melting. Happy spring, everyone!

Crescent Saturn

Do you love to look at the crescent moon? Here's a view of the crescent planet Saturn.

Zoom in on 680-gigapixel interactive mosaic of moon’s north pole

Click around on a new high resolution interactive mosaic of the moon's north pole, created using cameras aboard NASA's Lunar Reconnaissance Orbiter.

Watch ‘father of inflation’ learn of gravitational waves discovery

Physicist Andrei Dmitriyevich Linde is one of the main authors of inflationary universe theory. Watch his emotions as he learns his theory was proven true this week.

Asteroid to eclipse bright star Regulus tonight

Millions of people in New York City and points north can watch late tonight (March 19-20) as the bright star Regulus winks out when the asteroid hides it from view.

Amazing green flash atop sun pyramid

The green flash is an optical phenomenon you can see shortly after sunset or before sunrise. For a second or two, the upper rim of the sun flashes green.