For those confused, this combined with liquid water being there makes this the strongest evidence of alien life to date.
These are conditions shockingly similar to earth.
For anyone wondering, the reason Europa (as well as Saturn’s Enceladus) is warm enough to have oceans is because of the tidal friction from the large gas giant right next to it. (Also why Io is constantly erupting, it’s so close to Jupiter it can’t stop) Any life on these moons could resemble the life we have in geothermal vents and sunless depths of our own ocean.
