Enjoying EarthSky? Subscribe.

230,892 subscribers and counting ...

Mystery of sun’s coronal heating

Exploding “heat bombs” might explain why the sun’s upper atmosphere, or corona, sizzles at millions of degrees – hundreds of times hotter than at the surface.

See it! Moon sweeps past evening planets

Crescent moon back in evening sky, sweeping past 3 bright planets. Wonderful photos here! Thanks to all who submitted. Keep watching this post for more. It’s going to get even more beautiful!

What’s the hottest Earth has ever been?

Earth’s hottest periods occurred before humans existed. Those ancient climates would have been like nothing our species has ever seen.

It’s a bird, a plane, the tiniest asteroid!

Asteroid 2015 TC25 is small enough to be straddled by a person, reminiscent of the iconic bomb-riding scene in the movie Dr. Strangelove. It swept between us and the moon a year ago.

More From Latest
keyboard_arrow_down

Star of the week: Hamal

Hamal, also known as Alpha Arietis, is the brightest star in Aries the Ram. Learn the role this star played in defining the term First Point in Aries.

Aries? Here’s your constellation

How and when to see the constellation Aries in the night sky, plus info about this constellation in the history of astronomy and in mythology.

December guide to the bright planets

Three bright planets appear at nightfall in December 2016: Mercury, Venus and Mars. Jupiter reigns as the sole morning planet. Saturn is lost in the sun’s glare.

Hurricane risk to US northeast coast

Due to shifting weather patterns, the northeastern coast of the United Sates could see more frequent and more powerful hurricanes in the future, says new research.

Watch for earliest sunsets before solstice

Year’s shortest day comes at winter solstice. But, for Northern Hemisphere, earliest sunsets happen around early December. Southern Hemisphere? Your earliest sunrises are around now.

What would Earth be like with no moon?

Earth without its moon would be a very different world indeed. No eclipses. Smaller tides. But the biggest change would be in the length of Earth’s day.

2016-17 winter outlook for US

NOAA’s outlook for this winter predicts a warmer, drier South, and cooler, wetter North. Drought is expected to persist in California and expand in the Southeast.

First images from ExoMars mission

A camera on board ESA’s ExoMars mission has returned its first images from orbit. It was meant to be a test, but the images are spectacular.

Supernovas and ultra-diffuse galaxies

These strange galaxies have 1,000 times fewer stars than the Milky Way, yet occupy a large space. Astronomers used an advanced computer simulation to show that supernova explosions helped create them.