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00:00K2-18b is 2.5 times the size of Earth, and it's 700 trillion miles away.
00:07The James Webb Space Telescope is so powerful,
00:10it can analyse the chemical composition of the atmosphere
00:13from the light that passes through it from the small red star it orbits.
00:18Its chemical signature seems to suggest that it contains molecules
00:22which on Earth can only be produced by living organisms,
00:26and it's such a strong signal that if it is home to life,
00:29it's plentiful.
00:31K2-18b is thought to be a water world covered entirely by a vast ocean,
00:38and the evidence is growing that it may be teeming with life.