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Title: The Galactic Habitable Zone

We propose the concept of a "Galactic Habitable Zone" (GHZ). Similar to the circumstellar habitable zone (CHZ), the GHZ is that region in a spiral galaxy where life can exist. The width of the GHZ ismore » controlled by two factors. The inner (closest to the center of the galaxy) limit is set by threats to complex life: nearby transient sources of ionizing radiation and comet impacts. Such threats tend to increase close to the galactic center. The outer limit is imposed by galactic chemical evolution, specifically the abundance of heavier elements. Observation of stars in the Milky Way galaxy suggests that the outer reaches of a spiral galaxy may be too poor in heavy elements to allow terrestrial complex life to exist.« less
Title: The Galactic Habitable Zone
Authors:
Publication Date: 2009-08-21
OSTI Identifier: 987420
DOE Contract Number: AC02-07CH11359
Other Number(s): Other: The Galactic Habitable Zone
Resource Type: Multimedia
Specific Type: Multimedia Presentation
Resource Relation: Conference: Fermilab Colloquia, Fermi National Accelerator Laboratory (FNAL), Batvia, Illinois (United States), presented on August 21, 2002
Research Org: FNAL (Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States))
Sponsoring Org: USDOE Office of Science (SC)
Subject: 79 ASTRONOMY AND ASTROPHYSICS
Publisher: Fermilab Colloquia Online: 2000 to the Present Videos of Science Lecture and Presentations from the Colloquium Program at Fermi National Laboratory
Country of Publication: United States
Language: English
Run Time: 0:56:10
System Entry Date: 2016-01-27