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Editors of EarthSky
How far is Betelgeuse, the famous red supergiant star?
Betelgeuse is bright and it's exciting because one day it will explode - but how far away is it, really? Astronomers aren't sure.
January 26, 2024
When does Friday the 13th have a full moon? Next one is 2049
Want to see some dates when a Friday the 13th and a full moon fall on the same day? Here are past and future Friday the 13ths with full moons.
January 13, 2024
Today in science: Luna 1, 1st spacecraft headed to moon
Some historians believe the Soviet spacecraft Luna 1 was supposed to hit the moon. It didn't. However, it was the first earthly craft to sweep past the moon.
January 2, 2024
Orion the Hunter and the Milky Way on December evenings
The constellation Orion the Hunter is very easy to find. If you have a dark sky, you can also see the luminous band of the Milky Way running behind it.
December 17, 2023
Use Orion’s Belt to find 4 bright stars in the sky
How to use Orion's Belt to find 4 bright stars - Betelgeuse and Rigel in Orion - Aldebaran in Taurus the Bull and Sirius in Canis Major.
December 5, 2023
Kelvin-Helmholtz clouds look like ocean waves
Kelvin-Helmholtz clouds - aka fluctus clouds - can sometimes look like ocean waves. Check out these photos of them!
December 3, 2023
Achernar is the End of the River of Eridanus constellation
Achernar is the 9th brightest star and flattest star known. It marks the end of Eridanus the River. Here's why much of Earth never sees it ... and how you can.
November 22, 2023
Jupiter as you’ve never seen it. Thanks, Hubble!
The giant planet Jupiter reached opposition this week, coming closest to Earth for the year. In celebration, NASA released this ultraviolet view of Jupiter.
November 3, 2023
The Local Group is our galactic neighborhood
What is the Local Group? It's a collection of the nearest galaxies in space. Read more about these neighbors of our home Milky Way galaxy.
October 24, 2023
Riding Light: Tour the solar system at light speed
Tour the solar system at the speed of light in the video Riding Light. This video represents a photon leaving the sun and traveling past the inner planets to Jupiter.
October 15, 2023
