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Giant sunspots, solar flares, aurora alert!

Sunwatchers are still tracking those 2 large sunspot groups making their way across the Earth-facing side of the sun. Then yesterday there was an X-flare! Watch for possible auroras.

See an extra-red moon or sun this week?

If you live in the U.S. or Canada, a peculiarly red moon – or very spectacular sunrise or sunset – might be due to smoke from wildfires. Click in for images from Earth and space.

Watch for zodiacal light or false dawn

The zodiacal light is an eerie light extending up from the horizon. No matter where you are on Earth, springtime or autumn is the best time to see it.

How Earth looks from outer space

If you were looking with the eye alone, how far away in space would our planet Earth still be visible?

Asteroid Florence found to have 2 moons

3122 Florence passed yesterday, biggest near-Earth object to pass so close in a century. Radar revealed 2 orbiting moons! Plus a chart that’ll help you spot the asteroid.

Capricornus? Here’s your constellation

No matter where you live worldwide, Capricornus the Sea-goat climbs highest in the sky in early September. How to see it, and how a sea-goat came to reside among the stars.

Alpha Cephei is a rapidly rotating star

While not one of the most conspicuous stars in the night sky, Alderamin – aka Alpha Cephei – is easy to spot, and is interesting for its rapid rotation on its axis.

Astro festivals, star parties, workshops

What could be more fun on a cool, crisp autumn evening than a star party? Find a 2017 star party near you.

How far is a light-year?

How can we comprehend the distances to the stars? This post explains light-years in terms of a scale of miles and kilometers.

When’s the next U.S. total solar eclipse?

After the August 21, 2017 eclipse, the next total solar eclipse visible from North America will be April 8, 2024.