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Where was dark matter in the early universe?
Surprising new observations of distant galaxies suggest that dark matter was less influential in the early universe than it is today.
March 17, 2017
Weekend moon near Antares and Saturn
The moon is waning, appearing later each night. It's in a pretty inconspicuous place in our sky. But if you start watching these objects now, you'll get a preview of their excellent show coming up this June.
March 17, 2017
Great Barrier Reef is dying
Authors of a cover story in journal Nature this week called for immediate global action to reduce the magnitude of climate warming in order to secure a future for coral reefs.
March 16, 2017
Celestial spiral is a double star
It's not a spiral galaxy. It's a double star system seen from Earth to create a spiral shape in a shell of gas.
March 16, 2017
Closest-yet star to black hole
Astronomers have found a star that whips around a black hole about twice an hour. That's a very close orbit, possibly the tightest orbital dance ever witnessed for a star and black hole.
March 15, 2017
Real-life Hoth is disappearing
Hardangerjøkulen, the Norwegian ice cap better known to Star Wars fans as the ice planet Hoth, is melting and may disappear by 2100.
March 15, 2017
Venus as a crescent world
Photos from the EarthSky community of the planet Venus - next planet inward from Earth in orbit around the sun - in early 2017, in a crescent phase.
March 15, 2017
See it! Moon sweeps past Jupiter
Monday and Tuesday nights, the waning moon and this planet were near each other and the 2 brightest things in the night sky. Photos from the EarthSky community.
March 15, 2017
Back-to-back Mars dust storms
In the past few weeks, the Mars Reconnaissance Orbiter has reported 2 dust storms that sprang up in Mars northern hemisphere, then blew up to continent-size upon shifting southward.
March 14, 2017
Moon shadow path in 2017 solar eclipse
Fly along with the moon’s shadow in this NASA video depicting the path of the August 21, 2017 total eclipse of the sun.
March 14, 2017
