This star in the constellation Cetus varies in brightness like clockwork over 11 months.
Posts by EarthSky
A global fire alert from space, FireSat sensors would be able to detect a fire anywhere on Earth within 15 minutes of its start and notify area emergency responders.
“If we lived around a star like this one, we wouldn’t have any satellite communications. In fact, it might be extremely difficult for life to evolve at all …” said Harvard astrophysicist.
A ring or circle of light around the sun or moon is called a halo by scientists.
The November 20, 2015, moon is near the First Point of Aries on the sky’s dome. How to spot it, and what it means.
Kepler-438b – 470 light years from Earth – ranks highest on the Earth Similarity Index. But radiation from its violent parent star makes it uninhabitable.
At this time of year, for all of us around the globe, the Pleiades cluster culminates – reaches its highest point in the sky – around midnight.
No Mars rover has yet visited a sand dune, as opposed to smaller sand ripples or drifts. Curiosity will visit actual Mars dunes in the next few days.
Over its lifetime of about 25 years, an Arctic Tern can fly a million kilometers – nearly three times the distance from the Earth to the moon.
Some fun for a Friday, from the guys at AsapScience.