Enjoying EarthSky? Subscribe.

150,812 subscribers and counting ...


The sun in extreme ultraviolet, false color green
Science Wire | May 21, 2015

10 things you might not know about stars

Here’s a collection of 10 unexpected, intriguing facts about the stars of our universe – including our sun – that you probably didn’t know!

Tonight | May 21, 2015

Give me five minutes and I’ll give you Saturn in 2015

Best time to see Saturn in 2015 is here! Instructions for finding this beautiful golden planet … here.

Space X Dragon attached to ISS by robot arm
Science Wire | May 21, 2015

SpaceX Dragon is back on Earth

SpaceX confirmed splashdown of Dragon in Pacific Ocean at 12:42 pm ET (1642 UTC), 155 miles SW of Long Beach, California.

Artist's concept of LightSail, via the Planetary Society
Science Wire | May 20, 2015

LightSail launch success!

Sailing on sunbeams. LightSail successfully launched May 20 at 11:05am EDT (1505 UTC). Info on how to follow from here, below.

Scientists are scrutinizing these three boulders on Comet 67P/Churyumov-Gerasimenko.
Science Wire | May 19, 2015

A balancing rock on Rosetta’s comet?

In close-up images via the orbiting Rosetta spacecraft, the rock looks poised like a ballerina, with only a tiny fraction of its surface touching the ground.

Venus (above ridgeline) and Jupiter, plus an aurora, taken this weekend by EarthSky Facebook friend Glenn Miles Photography in Northern Ireland.
Science Wire | May 19, 2015

Jupiter and Venus draw closer!

The sky’s two brightest planets are getting ready for a spectacular conjunction in late June and early July. Start watching them now! Charts and info here.

This map shows the rover's entire traverse from landing to that point. Image credit: NASA/JPL-Caltech/MSSS/NMMNHS
Science Wire | May 18, 2015

Video: First marathon on Mars

On Earth, a fast runner takes a few hours to complete a marathon. On Mars, it took the Opportunity rover 11 years. New short video on Opportunity’s marathon trek.

Young fractures on the surface of Europa.  Read more about this image via NASAPhotoJournal
Science Wire | May 18, 2015

Sea salt on Jupiter’s moon Europa

Europa is thought to have a subsurface ocean. Salt from this hidden sea might be emerging in long fractures visible in the moon’s crust.

Artist's concept of a quasar, via European Southern Observatory
Science Wire | May 17, 2015

Four quasars in a row

Astronomers at Keck Observatory in Hawaii have found a quartet of quasars, embedded in a giant nebula of cool, dense gas. The odds of four of them being so closely packed purely by chance is about 1 in 10 million.

Possible iridium flare via Simon Waldram
FAQs | May 16, 2015

I saw a flash in the night sky. What is it?

We can’t always say for sure what you saw in the night sky. But it might have been a flare from an iridium satellite.