If we allow for a simple runaway greenhouse effect, the inner boundary of the Sun's habitable zone would be

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The inner boundary of the Sun's habitable zone, allowing for a simple runaway greenhouse effect, is estimated to be roughly halfway between the orbits of Earth and Venus. This is based on the understanding that closer to the Sun, the increased solar radiation would lead to a runaway greenhouse effect, making the planet too hot to support liquid water and, by extension, life as we know it.

If We Allow for a Simple Runaway Greenhouse Effect, the Inner