A star is born

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Take 2 minutes to learn about the life and death of a planetary system in this new video from NASA.

December 26, 2018

Is time travel possible?

Sure it is, says this physicist, but only if you have an object with infinite mass. Here’s the story of how to build a time machine, with a design that's deceptively simple.

EarthSky Voices

December 26, 2018

Moon and Royal Star on December 25 and 26

These next two nights - December 25 and 26, 2018 - you might see the moon and Regulus, the Royal Star, coming up above your eastern horizon before your bedtime.

Bruce McClure

December 25, 2018

Eureka! Astronomers find a Big Bang fossil

Only 2 other fossil clouds are known in our universe, and both were serendipitous discoveries. Then astronomers began searching for these rare relics, and found one!

Editors of EarthSky

December 23, 2018

The case of the vanishing exoplanet

Astronomers have found an exoplanet - the 2nd of its kind now - that is gradually "evaporating" as its hydrogen atmosphere leaks away into space.

Paul Scott Anderson

December 23, 2018

Moon and Gemini on December 23 and 24

On December 23, 2018, the moon is in front of the constellation Gemini, near its brightest stars Castor and Pollux. The next night, December 24, you'll find the moon farther from these stars but still near enough to help you find them.

Bruce McClure

December 23, 2018

See it! Jupiter and Mercury close

A beautiful drama is taking place low in the east before sunup this week. Giant planet Jupiter and innermost planet Mercury have swept close, with dazzling Venus above. Photos here from the EarthSky community.

Deborah Byrd

December 22, 2018