ASTR 100 Study Guide - Final Guide: Inverse-Square Law, Ellipse, Main Sequence

• School: Ball State University
• Department: Astronomy
• Course: ASTR 100
• Professor: Ryan Bartholomew

Document Summary

Planets move in elliptic orbits with sun at 1 of the 2 foci that define the ellipse. Review session for final: ellipse = sum of distance from foci, or points, d1 + d2 = constant, major axis goes through 2 foci, semi major axis is half of the major axis. Average speed of orbit: how long it takes the planet to orbit the sun. Visible: r, o, y, g, b, i, v, red = long wavelength end. Longest to shortest: gamma rays, x-rays, uv, visible, infrared, microwave, radio. Usually, students struggle (cid:449)ith : radio, microwave, infrared, visible, uv, x-rays, gamma rays. Sometimes there is a couple questions of both of these. Going to want to know the properties of blackbodies. (cid:862)double distan(cid:272)e (cid:271)et(cid:449)een you and the earth, ho(cid:449) does the gra(cid:448)itational for(cid:272)e (cid:272)hange? (cid:863: decreases by a factor of four, g x m1 x m2/r(squared)