GG281 Lecture Notes - Milky Way, Nuclear Fusion, Transect
Document Summary
The earth has been habitable and the sun"s energy has become fusion. Processes that occur on earth all tie together, Source of energy: energetic particles, geothermal, anthropogenic, solar electromagnetic radiation. 1 300 000 earths would fit within the volume of the sun. Pattern of evolution of energy emission from sun along this transect (core to surface)- energy dissipation occurs and type of energy emitted changes planck"s law. Sun reverses it polarity every 7 years. Humans wanted to know what produces the sun"s energy, and is it finite. In the 1800"s nuclear process were not understood. In 1700"s law of conservation of mass came about. Pressure within the sun is 340 000 000 tonnes/cm2 while the earth is only ~3600 tonnes/cm2. Planck"s law: the amount of energy emitted at wavelength by a body (like the sun, or earth, a chair etc. ) at temperature t, c1, c2 are constants.
