's James Webb Space Telescope (JWST) has discovered its first planet - and the rocky world is a similar size to our own.Formally classified as LHS 475 b., the is 99 per cent of Earth's diameter, and while it is terrestrial, scientists do not yet know if it has an atmosphere.Although the team cannot conclude what is present, they have ruled out a thick methane-dominated atmosphere similar to that of 's moon Titan.
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