Observing the Solar System

Observing the Solar System

Observing the Solar System Section 20.1 Early Observations Greek Observations Saw star patterns in the sky travel together (Constellations)

Early Observations Some stars seemed to wander (planets) They were later named by the Romans (Mercury, Venus, Mars, Jupiter, Saturn) Early Observations

Most Greek astronomers believed that Earth was in the center of a celestial sphere. (geocentric system) Early Observations Claudius Ptolemy Earth in center

Planets move on small circle that move on bigger circles Widely accepted for 1500 years Early Observations

Nicholas Copernicus Believed in a sun centered system (Heliocentric) Mikolaj Kopernik Said the planets moved around the sun in circles in

1543 Early Observations Nicholas Copernicus Was banned by the Catholic church Mikolaj Kopernik

Galileo Used the telescope to support him (Venus phases, Jupiters moons) Was placed under house arrest

Galileo Early Observations Tycho Brahe Made accurate observation for over 20 years

Early Observations Johannes Kepler Analyzed Brahes observations and found that the path of the orbits were ellipses

Keplers 1st Law Early Observations Johannes Kepler He found that the speed of orbiting planets is constantly changing Keplers 2nd Law

Early Observations Johannes Kepler When he compared planets, he found a relationship between how far from the sun they

were and the time to make one orbit Keplers 3rd Law Early Observations Today we know of 8 planets (MVEMJSUN) their moons, and smaller objects that

revolve around the sun What about Pluto? According to the new definition, a full-fledged planet is an object that orbits the sun and is large enough to have become round due to the force of its own gravity. In addition, a planet has to dominate the neighborhood

around its orbit. Pluto does not dominate its neighborhood Charon is half it size It does not sweep up its neighborhood, there is much debris in its orbit

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