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Another seasonal signpost
Earth's tilt on its axis causes the seasons. The tilt causes the Northern and Southern Hemispheres to trade places, in receiving the sun's rays most directly.
March 20, 2015
Dawn breaks over Ceres … and perhaps reveals signs of habitability
The Dawn spacecraft is about to start its investigation of Ceres. Suggestions of icy volcanism have led to speculation that the dwarf planet could potentially be habitable.
March 18, 2015
Aurora and mysterious dust cloud around Mars
Spacecraft spies two strange phenomena in the Martian atmosphere: An unexplained high-altitude dust cloud and aurora that reaches deep into the Martian atmosphere.
March 18, 2015
Extinct giant lobster bigger than a human
A 480-million-year-old fossil of a gigantic sea creature is giving paleontologists insights into the ancestors of modern-day arthropods such as lobsters and scorpions.
March 18, 2015
Awesome St. Paddy’s Day aurora!
Photos from the EarthSky community of the March 17, 2015 aurora.
March 18, 2015
Most stars have planets in habitable zone
Researchers calculate that billions of stars in our Milky Way galaxy have 1-3 planets in the habitable zone, where there may be liquid water and life.
March 18, 2015
It’s been snowing in Hawaii
Check out this early March 2015 Landsat image of snowfall on Mauna Kea, Hawaii's highest point.
March 17, 2015
1,400+ new marine creatures identified last year
A global effort to create a consolidated inventory of all existing sea life announced the results of eight years of work.
March 16, 2015
Colors of life on exoplanets
Scientists measure chemical fingerprints for 137 different microorganism species. They hope astronomers will use the colors to recognize life on distant planets.
March 16, 2015
Possible rings around minor planet Chiron
Chiron is the second minor planet and the second centaur - orbiting beyond Jupiter in the outer solar system - suspected to have a ring system.
March 16, 2015
