Nasa's Spitzer Space Telescope could be used to find Mars-size alien planets capable of supporting life, it has been claimed.

Researchers at MIT say the telescope could look for small, rocky exoplanets orbiting strange 'failed stars' known as brown dwarfs.

Researchers believe the hunt could uncover planets capable of supporting life.

'Our program represents an essential step towards the atmospheric characterization of terrestrial planets and carries the compelling promise of studying the concept of habitability beyond Earth-like conditions,' the team wrote.

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