Geography 2090A/B Study Guide - Quiz Guide: Late Heavy Bombardment, Axial Tilt, Formation And Evolution Of The Solar System
17 Oct 2018
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Magnetic fields: mercury: small, venus: no, mars: small, outer planets: strong. Radiation belts: bands of energetic electrons and protons held in place by the magnetosphere. Solar system formation: 4. 6 bil years ago: solar nebula forms, 700 mil years later: planets form, late heavy bombardment. Orbits: pla(cid:374)ets follo(cid:449) kepler(cid:859)s la(cid:449)s, planets orbit ccw (prograde, planets orbit on the plane of the ecliptic. Kepler(cid:859)s la(cid:449)s: first law: planets have elliptical orbits, second law: a line joining a planet and the sun sweeps out equal areas during equal time intervals. Axial rotation: planets rotate around their axis in prograde (ccw, venus spins retrograde, uranus has the most axial tilt (also retrograde, mercury and venus rotate really slowly. Earth and the moon are in tidal locking (moon orbit = moon axial rotation) Lagrange points: any two bodies have 3 points that are not entire stable, and 2 points that are stable if sufficient size difference.
