AST 1002 Lecture Notes - Lecture 5: Tiny Planets, Oort Cloud, Trade Union Confederation Of The Americas
Document Summary
1 star, 8 planets, 120 moons, asteroids, comets, meteoroids. Dista(cid:374)(cid:272)es to all pla(cid:374)ets are k(cid:374)o(cid:449)(cid:374) fro(cid:373) kepler"s la(cid:449)s. Mercury, venus, earth, mars, asteroids, jupiter, saturn, uranus, neptune. We determine masses from their gravitational effects on nearby objects. All planets orbit in the same direction, the same orbital plane, the ecliptic, except pluto. ~0. 7 au from the sun, ~95% size of earth. Ma ive at(cid:373)osphere, (cid:1013)(cid:1004)(cid:454) earth"s at(cid:373)ospheri(cid:272) pressure (cid:894)pressure like ~1 km under the ocean) Often the brightest visible star right around sunrise and sunset. The at(cid:373)osphere for(cid:373)ed (cid:271)(cid:455) (cid:862)outgassi(cid:374)g(cid:863) volcanic activity releasing water vapor, Greenhouse gases like co2 are transparent to visible light but partly opaque to ir. (cid:862)glo(cid:271)al (cid:449)ar(cid:373)i(cid:374)g(cid:863) o(cid:374) earth results addi(cid:374)g (cid:373)ore gree(cid:374)house gases (cid:894)(cid:271)ur(cid:374)i(cid:374)g fossil fuels(cid:895) Venus is 30% closer to the sun and receives 2x more radiant energy than earth. Too hot to absorb co2 and other gases into rocks/ground (and oceans, as on earth) Also, on earth, plants absorbed co2 and produced o2.
