Although aliens may live in other conditions than what we’re used to, here is some more background on their theory:

Kepler-186f goes around an M-type dwarf star that’s smaller and cooler than our sun. But it orbits much closer to its parent star than Earth does, within what would be Mercury’s orbit in our own solar system. Those two factors combine to produce an environment that could allow for liquid water on the surface, assuming that the planet had a heat-trapping atmosphere.

“The star, to our eyes, would look slightly orange-y,” about a third again as big as our sun but only a third as bright, said co-author Thomas Barclay, a staff scientist for NASA’s Kepler mission who is also affiliated with NASA and the Bay Area Environmental Research Institute. At midday, Kepler-186f’s landscape might look similar to what we see on Earth an hour before sunset, he told NBC News.
Or it might not: If the planet lacked an atmosphere to retain and redistribute its sun’s warmth, it would be a cold, dry, lifeless world.

Kepler-186f probably rates as the most potentially Earthlike planet discovered so far, said Jim Kasting, a geoscientist at Penn State University who did not play a role in the Science study. But he told NBC News that it’s still “less likely to be habitable than planets around more sunlike stars.” Even better prospects for alien habitability might well be identified in the months and years to come.

We hope to make contact with aliens if they’re cool!  And we hope you like the video.

thanks to advexon.com for the great info