Looking forward to 2017's total solar eclipse over North America? Then you'll enjoy these photos of the total solar eclipse over Indonesia in March 2016. They were the most-viewed images at EarthSky over this past year.
Imaginary line from Venus through Mars points to Neptune in late December 2016. Comet 45P/Honda-Mrkos-Pajdusakova in this part of sky, too, but - like Neptune - requires optical aid.
The U.S. state of Nevada experienced several moderately strong earthquakes and multiple aftershocks, beginning just after midnight local time Wednesday morning.
Dust shrouds the era of distant galaxies, in which most of today's stars were born 10 billion years ago. Astronomers used radio telescopes to pierce the dust.
Halos like this one around the sun or moon are caused by ice crystal high in Earth's sky. Notice the upside-down rainbow-like arc above. It's called a circumzenithal arc.