AST 111 Lecture Notes - Lecture 27: Milky Way, Exoplanet, Galactic Center

• School: Tunxis Community College
• Department: Astronomy
• Course: AST 111
• Professor: Reynolds

Document Summary

Earth life planets can form in only a relatively small region of the milky way. Stars further from the galactic center have lower proportions of elements. Less material is able to make terrestrial worlds. Planets atmosphere might protect life against the effects of this radiation. If jupiter didn"t exist: object may have remained in the solar system and would be. Extrasolar planets show that jupiter size planets are quite common. We don"t know whether it is common or rare to have jupiter in the right place for likely to pose an impact threat. Search for signals from other civilizations if generally known as the search for extraterrestrial intelligence (seti) Drake equation are currently sharing the milky way galaxy with us. Calculates the number of civilizations capable of interstellar communication that. Our galaxy is likely to have billions of habitable planets, but we cannot yet estimate the faction of them that actually have life.