The Earth used to be slap bang in the middle of our Sun's 'Goldilocks zone', an area in space determined by the respective sun's size, heat and radiation, where life can evolve.
However, the 1993 work on the Goldilocks zone hasn't been updated and Rowi Kopparapu thinks the time has come to do so.
Research shows that H2O and CO2 (excuse big numbers) absorb light from different types of stars.
Kepler-22b (a planet thought to be able to sustain life) no longer sits in its sun's Goldilocks zone, but neither do we! In fact, we are a toasty 1,000,000 Km closer to the sun from the warmer edge of the zone, it proves that Goldilocks zones, aren't everything to go by. The reason the Earth can sustain life is suggested to be its cloud cover.
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