Artist鈥檚 impression of an exoplanet
(Image: NASA)
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. 鈥淏ut they might have rocky, possibly Earth-like moons,鈥� says David Kipping of University College London.
, 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鈥檚 orbit, so the planet鈥檚 position and velocity would differ slightly on each transit. Existing telescopes could detect an Earth-mass moon around a Neptune-mass gas planet, he says.
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