Tarduno and Eric Mamajek an astronomer at the University of Rochester used observations of young sunlike stars to infer how strong a solar wind the Earth was up against .

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HARPS ' observations of 376 sunlike stars has led the team to conclude not only that more than half of such stars are surrounded by planets but also that about 40 per cent of them have at least one planet less massive than Saturn .

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These asteroid-sized objects pack sunlike masses extremely small orbits and incredibly fast spins .

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The disrupted sunlike star could form a massive disk in orbit around the dwarf .

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Reviewing the history of exoplanets Debra Fischer a Yale astronomer recalled that the first planet found orbiting another sunlike star a Jupiter-like giant was discovered 20 years ago .

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