James Webb Telescope arrives in California

The James Webb Telescope's 2 component halves had been undergoing testing in Houston. They're now at Northrop Grumman Aerospace Systems in California, about to be assembled.

TRAPPIST-1 worlds likely terrestrial and water-rich

Terrestrial means more like Earth than Jupiter or Saturn. Water-rich means a potential for life. New insights about the 7 planets orbiting the nearby star TRAPPIST-1.

Watch online as 2 asteroids sweep close this week

How to watch online this week as 2 newly discovered asteroids - 2018 CB and 2018 CC - sweep closer to Earth than the moon.

Asteroid to buzz by Super Bowl Sunday

How to watch online as asteroid 2002 AJ129 - a relatively massive, fast-moving asteroid - passes at about 10 times the moon's distance on February 4, 2018.

Mount Sharp photobombs Mars rover selfie

Mars' Mount Sharp - whose flanks are the focus of the Curiosity rover's studies on Mars - photobombed this January 2018 selfie of the rover.

View of Mars rover’s journey so far

Check out this sweeping vista on the planet Mars, taken by the Curiosity rover from a mountainside ridge. It provides a look back at key sites visited by the rover since its 2012 landing.

See it! Super Blue Moon eclipse photos

It was a Blue Moon, a supermoon and a moon in total eclipse. EarthSky community members around the world came through as always with awesome photos.

Why space radiation won’t stop human space exploration

Videos and links related to potential health effects to astronauts from space radiation, plus solutions and countermeasures.

Close-up on a giant star

Astronomers have created the first-ever detailed image of the surface of a giant star, about 530 light-years away and 350 times larger than our sun.

Research shows black holes push away their dinners

“Winds must blow away a large fraction of the matter a black hole could eat," researchers said.

Matching Donation Campaign

Exciting news! EarthSky received a $50,000 gift, with a request that it be used to collect matching funds. Please help us meet this match by donating to EarthSky today!

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