sun
A Red Moon – NOT a Sign of the Apocalypse!
On most evenings, the Moon will appear as a bright yellow or white color in the night sky. But on…
Astronomy Cast Ep. 371: The Eddington Eclipse Experiment
At the turn of the 20th Century, Einstein's theory of relativity stunned the physics world, but the experimental evidence needed…
How Far Back Are We Looking in Time?
When we look out into space, we're also looking back into time. Just how far back can we see? The…
Could There Be Another Planet Behind the Sun?
If you've read your share of sci-fi, and I know you have, you've read stories about another Earth-sized planet orbiting…
Skywatchers Identify Aircraft as They Pass in Front of the Sun
It’s all about timing and location. You’ve probably seen images we’ve posted on Universe Today of planes crossing in front…
What it Would Look Like if the Sun was Replaced with Other Stars?
How would our horizon look if Earth orbited around another star, such as Alfa-Centauri, Sirius, or Polaris? Roscosmos TV has…
How Much Water Would Extinguish the Sun?
Have you ever wondered how much water it would take to put out the Sun? It turns out, the Sun…
How Did We Find the Distance to the Sun?
How far is the Sun? It seems as if one could hardly ask a more straightforward question. Yet this very…
Solved: The Mystery of Earth’s Theta Aurora
The mystery of the northern lights – aurora - spans time beyond history and to cultures of both the southern…
NASA’s NuSTAR Scans the Sun with X-ray Vision
What if you had x-ray vision like Superman? Or if those funny-looking glasses they advertised in comic books in the 60s…