Scientists say they have detected an atmosphere around an Earth-like planet for the first time, BBC reports.

They have studied a world known as GJ 1132b, which is 1.4-times the size of our planet and lies 39 light years away.

Their observations suggest that the "super-Earth" is cloaked in a thick layer of gasses that are either water or methane or a mixture of both.

Discovering an atmosphere, and characterising it, is an important step forward in the hunt for life beyond our Solar System.

But it is highly unlikely that this world is habitable: it has a surface temperature of 370C.

Dr John Southworth, the lead researcher from Keele University, said: "To my knowledge the hottest temperature that life has been able to survive on Earth is 120C and that's far cooler than this planet."

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