None of the potentially habitable Earth-like exoplanets known to astronomers today have the right conditions to sustain life as we know it on Earth, with a rich biosphere of plants, microbes and animals, a new study has found. 

The study, published in the journal Monthly Notices of the Royal Astronomical Society on Wednesday (June 23), assessed the basic conditions for oxygen-based photosynthesis on ten Earth-like exoplanets with known masses that orbit in the so-called habitable zones around their stars. 

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