Maybe some extra-terrestrials pollute their planets too.
Posts by EarthSky
The Andromeda galaxy is approaching our Milky Way galaxy across the vastness of space. When will they collide?
The last below-average global temperature for June was in 1976 and the last below-average global temperature for any month was February 1985.
Twilight is the time of day between daylight and darkness. Astronomers, the experts on nighttime, recognize three kinds of twilight.
The multiverse hypothesis – the idea that there are other universes – can be tested, scientists say.
If you’re a beginning stargazer or a veteran of thousands of starlit nights, binoculars can be your best friend. Here’s how to get started.
It’s said that once you’ve seen a green flash, you’ll never go wrong in matters of the heart. Here’s all you need to know … plus great pics.
Telstar was the first satellite able to relay television signals between Europe and North America. It launched on this date … and helped change the world.
2014 has been a great year for noctilucent, or night-shining, clouds, seen at high latitudes only from about mid-May to August. Wondrous, if you can catch them!
They’re about to become genetic models for astronauts, to help explore the long-term effects of space flight and deep space travel.