The atmosphere of the sun may extend beyond the orbit of the earth before its density falls to that of the gas in interstellar space. Where, then, does the earth's atmosphere end and the sun's begin?

Scientists may have discovered proof of life on a far away planet twice the size of Earth, as the giant emits gas "only produced by life". Astronomers believed they had detected a gas in the ...

As some of the most energetic phenomena in the universe, supernovae occurring within 60 light-years of Earth could have stripped our planet's atmosphere of its protective ozone layer, exposing ...

At least two mass extinction events in Earth's history were likely caused ... star—may have previously stripped our planet's atmosphere of its ozone, sparked acid rain and exposed life to ...