ASTR 101 Lecture 27: Other Planetary Systems, Radioactive Decay, Intro to Age of the Solar System
16 Nov 2016
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Lecture 27 - other planetary systems, radioactive decay, intro to age of the solar system. Planets that are large in size ( block more light during transits), massive in mass (make parent star wobble), and closer to stars (more likely to produce transits, and stronger gravitational wobbling effect) are easier to nd. Q. why are so many jupiters" so close to the parent stars. A. complex gravitational interactions b/w planets cause them to migrate (move around in planetary system) over the passage of many million years; smaller planets may eject from system. Nding oxygen in atmosphere of planet is proof of life; oxygen is there means there is light. James webb telescope is set to detect life on other planets. Neutrons and protons are 2000x heavier than electrons. # of proton determines chemical nature of atom and what kind of element you have. # of protons + # of neutrons = atomic mass #
