But there is a way to counter the increasing brightness of the Sun, the scientists believe - just increase the radius of the Earth's orbit!

BBC: Blue Marble Nasa

These eye-in-the-sky cell towers hover between 70, 000 and 100, 000-feet and provide coverage for a 200-mile radius on Earth- but the darn things only stay aloft for 24 to 48 hours before freefalling to the ground (or tree, or lake, or Grand Canyon).

ENGADGET: Cash-in on your geocaching skillz

Kepler 37b and c are about 30% and 74% as large as the Earth, and Kepler 37d is about twice Earth's radius.

BBC: Exoplanet Kepler 37b is tiniest yet - smaller than Mercury