NATS 1745 Study Guide - Circumstellar Disc, Planetary Nebula, Asteroid Belt
24 Apr 2015
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Relevance: built the largest telescopes of his time. 1781: discovered uranus and its two moons after trying to detect parallax. 20 au from the sun (orbital period = 84 years). Asteroid belt: orbits the sun on its side and is a gas giant. 1772: bode showed that planetary distances follow a numeric sequence ( bode"s law ) Asteroid is greek for star-like : circular belt containing hundreds of asteroids was discovered between mars and jupiter, thousands of known asteroids in the belt, ranging in size from pebbles to small moons. Neptune: deviations in orbit of uranus led to the finding of neptune, found independently by french and english. 30 au orbital / 17x mass of earth period and named after neptune (sea god) Solar system: sun"s birth from a spinning, collapsing gas cloud, leftover gas & rocks in the circumstellar disk coalesced into planets, proof has been found in star forming nebulae.
