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York University (12,867)
NATS 1880 (72)
Chapter

10.1 THE CONCEPT OF A HABITABLE ZONE.docx

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Department
Natural Science
Course
NATS 1880
Professor
Paul Delaney
Semester
Summer

Description
10.1 T HE C ONCEPT OF A H ABITABLE Z ONE Exo-planet surface life may be detected through images H OW DOES A PLANET ’S LOCATION AFFECT ITS and spectra, but subsurface does not emit any PROSPECTS FOR LIFE ? atmosphere change. This means we do not have a chance Habitable environments have at finding exo-subsurface life.  An energy source COULD LIFE EXIST OUTSIDE THE HABITABLE ZONE ?  Chemicals for life Life can exist outside habitable zones if it gets its energy  Liquid water (or other polar liquid) from elsewhere  Radioactivity  Internal Heat  Chemical Reactions Life can exist in small pockets of subsurface groundwater (Mars-like)  Water kept liquid due to geological conditions Life can exist in subsurface oceans Energy sources are they only real variable  Moons in outer regions contain mostly water ice  Earth’s energy source is the sun  Tidal heating and radioactivity melts this ice  Only at certain range of distances will the water This allows moon
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