For the first time scientists have identified water on a planet outside the solar system, suggesting it could support life.
The team at University College London have detected water vapour in the atmosphere of a planet call K2-18b, a so-called 'super-Earth' with habitable temperatures.
Dr Angelos Tsiaras, an astronomer at UCL, says the team used the Hubble Space Telescope to analyse starlight filtered through the planet's atmosphere.
The planet sits in a system more than 100 light years away, meaning that any image captured in 2019 is an image of the planet 100 years ago.
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