Their distance from their host star is crucial from "summary" of Exoplanets and Alien Solar Systems by Tahir Yaqoob
The distance of a planet from its host star is a critical factor in determining its characteristics and potential for habitability. This distance, known as the planet's orbital distance or semi-major axis, has a direct impact on the planet's temperature, atmosphere, and potential for liquid water. Planets that are too close to their host star may be too hot to support life as we know it. High temperatures can lead to the loss of water and volatile compounds, resulting in a barren, inhospitable environment. These planets, known as "hot Jupiters," are often found orbiting very close to their host stars, with orbital periods of just a few days. On the other hand, planets th...
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