So far, no such planets have been observed directly, so it has not been possible to measure their spectra.

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The geocentric theory offered no explanation why the planets were revolving in these circles and offered no plausible picture of the universe as a whole.

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"We're talking about no more than four or five new planets, " says Iwan Williams.

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The discovery of a dozen of these extra-solar planets in the past three years in no way diminishes astronomers' delight in each new discovery.

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Dr Murray stressed there was no direct evidence these stars did have Earth-sized planets in orbit about them, but modelling had shown that if sufficient terrestrial material existed in a system it would eventually clump together into bodies as big as the Earth.

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Seager called the discovery of the three planets "a huge milestone, " but her excitement is tempered because potentially habitable planets have been announced in the past and there's currently no way to get more details, given how far away they are.

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But there are much bigger planets or even galaxies that are exerting big data gravitational pull on marketers no matter how prepared they are.

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For now there is no way to tell, except to look for warps or blobs in the disc caused by planets hiding in it.

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So if life can thrive in the dark, in isolation, in temperatures no warmer than -13C, where else could it be on Earth and beyond, on distant planets or moons for example?

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