Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-30
Astronomy and Astrophysics
Astrophysics
STScI Astrophysics of Life conference; 16 pages; 8 figures; Replacement version has additional co-author
Scientific paper
Interstellar material surrounding an extrasolar planetary system interacts with the stellar wind to form the stellar astrosphere, and regulates the properties of the interplanetary medium and cosmic ray fluxes throughout the system. Advanced life and civilization developed on Earth during the time interval when the Sun was immersed in the vacuum of the Local Bubble and the heliosphere was large, and probably devoid of most anomalous and galactic cosmic rays. The Sun entered an outflow of diffuse cloud material from the Sco-Cen Association within the past several thousand years. By analogy with the Sun and solar system, the Galactic environment of an extrasolar planetary system must be a key component in understanding the distribution of systems with stable interplanetary environments, and inner planets which are shielded by stellar winds from interstellar matter (ISM), such as might be expected for stable planetary climates.
Frisch Priscilla C.
Lopate Cliff
Mueller Holger
Zank Gary
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