How Much Longer Can Earth Support Life?
These zones are defined by water. In the habitable zone, a planet (whether in this solar system or an alien one) is just the right distance from its star to have liquid water. Closer to the sun, in the "hot zone," the Earth's oceans would evaporate. Of course, conditions for complex life, including humans, would become untenable before the planet entered the hot zone.
In 1.75 billion years the planet will travel out of the solar system's habitable zone and into a hot zone that will scorch away its oceans.
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