NASA’s SPHEREx observatory completes stunning 1st cosmic map

Blue-white Rigel shines as the brightest star in the constellation Orion the Hunter. It's a hot massive star, that someday will explode as a supernova. The post Blue-white Rigel is Orion’s brightest star first appeared on EarthSky.

Advanced aliens and fireflies on Earth might communicate in similar ways, by using signals of flashing light, a new theoretical study suggests. The post Do aliens and fireflies communicate similarly? first appeared on EarthSky.

The brightest stars in the Northern Hemisphere's winter sky form the shape of the Winter Circle, or Hexagon, that will help you locate 6 constellations. The post Meet the Winter Circle, aka the Winter Hexagon first appeared on EarthSky.

Is Europa's ocean habitable? A new study suggests it might be 'quiet and lifeless', with little to no geologic activity on the seafloor. The post Europa’s ocean ‘quiet and lifeless,’ new research suggests first appeared on EarthSky.

Arctic air is diving south across the United States, impacting millions of people, even as far south as south Florida! Get the forecast details here. The post Arctic air flowing into the southern United States Friday first appeared on…

Ready for some easy astronomy? How about the top 10 brightest objects in our solar system? If you've seen every one of these objects, congrats! The post Top 10 brightest objects in our solar system first appeared on EarthSky.

Computer simulations show the presence of Mars affects the cycles that cause Earth's ice ages. Without Mars, those cycles vanish. The post Earth’s ice ages shaped by tiny tugs from Mars first appeared on EarthSky.

Astronomers can detect the molecules of distant exoplanets when they pass in front of their stars. These molecules might help reveal signatures of alien life. The post How to detect signatures of alien life in exoplanet air first appeared…