PBS
That Time Oxygen Almost Killed Everything
Oxygen keeps us alive, but did you ever consider how Earth found the right balance? Eons produced this video as part of a larger series that explores when Earth contained very little oxygen and green oceans ruled the planet. Viewers see...
BBC
Bbc Newsround: One in Five Suns Has Habitable World
Using the Kepler telescope, NASA scientists have estimated that one in five of suns in space host an Earth-like planet in what is called the habitable zone.
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