NASA has found a whole solar system of Earth like worlds, around a star called TRAPPIST-1.
So what's the fuss about?
- Only three of these worlds are in TRAPPIST-1's habitable zone, but all have some potential for liquid water.
- It's a tiny solar system - it's outer edge would be inside the orbit of Mercury. So these potentially habitable worlds would be very close, appearing as big as the Moon in each others skies.
- The star itself is an ultra cool red dwarf, which will live for trillions of years
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