This preview shows page 1. Sign up to view the full content.
Unformatted text preview: Habitable Zones and Suitable Stars for E.T. zone , or life zone, is the distance from the star where the temperature on the surface is between the freezing point (0 C) and boiling point (100 C) of water. If you consider a planet with the same reflectivity (clouds and surface material) as the Earth, reradiates the solar energy it absorbed as efficiently as the Earth does, and rotates as quickly as the Earth does, then the habitable zone for the Sun (a G2 main sequence star) is between approximately 0.63 and 1.15 A.U. Calculations that include the effects of the greenhouse effect and whether or not there is a runaway process and ultraviolet dissociation of water like what happened on Venus shift the Sun's habitable zone outward so that the Earth is nearer the inside edge of the habitable zone. Climate research is still at the beginning stages of development, so the habitable zone boundaries are a bit uncertain. Note that the discussion in this section ignores the effect of internal heating are a bit uncertain....
View Full Document
- Fall '10