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Supernovae showered Earth with radioactive debris
The supernovae may have been less than 300 light-years away. The evidence comes from radioactive iron-60, found in ocean sediments and crust.
April 6, 2016
SETI turns focus to 20,000 red dwarf stars
Astronomers with the Search for Extraterrestrial Intelligence had their reasons for ignoring red dwarf stars in the past. But now that thinking has changed.
April 6, 2016
Asteroid swept within moon’s distance April 5
Astronomers did know in advance that asteroid 2016 FW13 would pass closely - but safely - on April 5, 2016. Check out a photo from the Virtual Telescope Project.
April 5, 2016
Astronomers await pings from troubled Hitomi
An unknown disaster seems to have befallen the Japanese satellite that launched in February. Why X-ray astronomers are anxious for good news.
April 5, 2016
Amazing moons of our solar system
Yes, we're eager to explore the other planets in our solar system. But their moons might be even more interesting ...
April 5, 2016
How to make a mountain on Mars
They're not mountains in the earthly sense. They're mile-high mounds, which - a new study says - were carved over billions of years by wind and climate.
April 4, 2016
Eclipse stories from Indonesia
The solar eclipse of March 9, 2016 brought together students from around the world - and EarthSky helped to make it happen.
April 4, 2016
Another asteroid clobbers Jupiter
Giant Jupiter is a frequent target for asteroid strikes, in part because of its size. This impact is the 5th we've seen in the past decade.
April 2, 2016
Global astronomy month begins April 1
April, 2016, is Global Astronomy Month 2016 (#GAM2016), organized by Astronomers Without Borders, whose motto is One People One Sky.
March 31, 2016
The extremely hot heart of quasar 3C273
Scientists combined telescopes on Earth and in space to learn that this famous quasar has a core temperature hotter than 10 trillion degrees! That's much hotter than formerly thought possible.
March 30, 2016
