What does it take to turn a habitable planet into a world more like Venus?
. Any water Venus once had on its surface boiled away, and the planet was left with a thick carbon-dioxide atmosphere.
However, not all planets on the inner edge of the habitable zone will necessarily evolve the same way that Venus has. For one, Venus does not have its own magnetic field to ward off the solar wind, the stream of charged particles flowing from the sun. This made it easier for theto carry away hydrogen atoms that were split from water molecules by ultraviolet light from the sun, thus depleting the planet of water.
"Looking at this planet will tell us what's happening on the inner edge of the habitable zone — how long a rocky planet can maintain habitability when it starts to get hot," KalteneggerKaltenegger's team modeled the planet based on its mass and radius, both of which astronomers have measured. The models also incorporated assumptions about the planet's chemical makeup, its surface temperature and pressure, the depth of its atmosphere and the amount of cloud present.
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