PCS 182 Lecture Notes - Lecture 5: Europa Europa, Radioactive Decay, Water Vapor
27 Jul 2017
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Icy volcanism geysers of ice, water vapor, methane, co2, nitrogen, organic molecules, salts: subsurface. Easier than probing through km of ice on. Europa: europa, one of the closest moons to earth! Maybe there exists microbes: we need to send a lander to, determine if subsurface oceans exists, search for surface organic molecules, amino acids, microbes. Star birth scenario: fg : (gm1m2)/r, random particle fluctuations in the cloud act as gravitational foci to attract more. A(cid:271)out (cid:1005)(cid:1004)5 years: tcore > 10 *10 6 . Stars form in vast interstellar hydrogen and helium clouds: as the universe ages, hydrogen is transformed into heavier elements inside the stars, hydrogen component of the universe is always!!!downward!! !upward: eventually news stars will cease to form and the stelliferous era will end. Extrasolar planets: 1992: first two exoplanets discovered in orbit around a pulsar! (psr b1257+12, 1995: 51 pegasi b = first exoplanet in the orbit around a main sequence star.
