If your star is dim and “cold,” your planet will have to be closer in order for life to thrive, meaning it could (not always the case, but we will get to that) be bigger in the sky. An extremely bright and hot star may appear as a very bright spec on your planet.Īll of these things set the (not-scientific) atmosphere of your book or campaign. These may be very small details to some, but there may come a time that these facts are important to know. Habitable/Goldilocks zone: the region around the star in which a planet can support life as we know it. Water can be liquid as opposed to boiling away or freezing. The planet is just warm, not hot, or cold. In this photo, you can see exactly where the habitable zone is. All planets in the red zone (part closest to the sun) are too hot for water to remain liquid. Planets in the blue zone (the farthest from the sun) are too cold for water to remain liquid. Size: how physically large the star is, *not* mass Right between the two zones is the “sweet spot” (green). Note: the more mass a star has, the more gravity it has as well. Luminosity: how physically bright the star isįun fact: Star temperature is typically measured in Kelvin, denoted as K. Zero degrees C (32 degrees F) is equal to 273 K. 0 Kelvin is called “absolute zero,” the point at which atoms cannot move.
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