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Such worlds might resemble the large moons of our outer solar system and harbor potentially clement conditions beneath an icy crust.

A planet’s atmosphere plays an even bigger role; if it’s loaded with greenhouse gases, then it needs to be farther out from the star to be clement.

For those of us hoping to find more clement Earth-like worlds, that wasn’t very satisfying.

The Hampden pitch bore the scars of Saturday's semi-final being played in horrible weather but Sunday's more clement conditions made for an engrossing tie.

Billions of years ago, before it became a freeze-dried desert, the Red Planet was much more Earth-like, with liquid water and clement temperatures at its surface.