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It is claimed that Mars (pictured) will appear so large in the sky on Aug. 27 that it will look as if Earth has two moons.

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Scientists have catalogued 450 exoplanets in the past 15 years, but most finds include up to three planets per star, usually gargantuan balls of gas similar to Jupiter or Saturn. (Illustration by France's space agency, the Centre National d'Etudes Spatiales)

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An artist's impression of the HD 10180 planetary system in the southern constellation of Hydrus 127 light years away Photo: PA

The devices scouring the red planet have sensors which detect dust build-ups and zap the surface of their solar panels with an electrical charge to keep them shiny Photo: AP