Planet wobbles could reveal Earth 2.0

2017-08-13 02:00:06

HIDDEN alien moons that could harbour life can be revealed by the wobbles of their planets. Almost all the 30 known exoplanets that sit within the habitable zone of their stars are gas giants. “But they might have rocky, possibly Earth-like moons,” says David Kipping of University College London. His calculations, which will appear in Monthly Notices of the Royal Astronomical Society, show that such moons would reveal their presence when the planet passes in front of its star as viewed from Earth. A moon would induce a wobble in the planet’s orbit,