The Hubble Space Telescope first caught a glimpse of water vapor jutting off the surface of Jupiter's tiny moon Europa in 2013. But scientists were skeptical, so a team performed follow-up observations throughout next year to see if these jets of water would reappear. Sure enough, Hubble caught three additional cases of, what appear to be jets. It's an exciting find that supports the notion that Europa contains a vast, subsurface ocean that might be the perfect place to discover the first signs of alien life.
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