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Mars was once a wet and habitable world, so what happened to change that? According to a new study from Washington University in St. Louis, Mars’ small size is likely to blame for why it lost most of its water and atmosphere.
When astronauts first went to space, it struck them that the atmosphere was this very thin crescent on the horizon (limb) of the Earth. This atmosphere is what we breath, what helps protect us from cosmic rays, and what keeps…
Supernova That Stunned Stargazers In The Year 1181 Has Finally Been Found â And Itâs A âZombieâ Star
The Chinese have a long, ancient history of recording âguest starsââsuddenly bright stars that appear in the sky for a while but then dim and disappear. Today we know these are rare, incredibly energetic supernova explosions from either massive stars or special, interacting binary systems that seed the Galaxy with heavy elements like iron and […]
EarthSky readers shared two amazing September deep sky photographs with us: the Cygnus Loop, a nebula that stretches into Vulpecula, and Bode’s Galaxy, aka M81.
The post September deep sky: Cygnus Loop and Bodeâs Galaxy first appeared on EarthSky.
NASA scientists say that there were once thousands of volcanic eruptions on Mars. These explosive blasts, in the northern Arabia Terra region, were “super eruptions,” the largest and most powerful kind known. The intense activity continued for about 500 million years, about four billion years ago.