| A | B |
|---|
| Plato | 423-347B.C. Philosopher who said to think about the universe instead of observing |
| Aristotle | 384-322B.C. Philosopher who was the "authority on everything" and said that the universe was centered around the earth and divided into two parts: "corrupt" earth and "perfect" heaven. |
| Ptolemy | 140A.D made geocentric(earth centered) model of the universe form Aristotle's ideas |
| Copernicus | 1473-1543 came up with the heliocentric(sun centered) model of the universe but didnt publish his ideas immediately because he was so closely associated with the Cathloic Church who burned people at teh stake for such ideas |
| Galileo | 1564-1642 defended the Copernican theory; discovered the following- Venus went through stages like our moon; Jupiter's moons; heavens wern't "perfect"(moons, craters, and solar flares) Eventullay found guilty by the Inquisition and was imprisioned for the last 10 years of his life |
| Tycho | 1546-1601 Vain and snobby Danish nobleman who wore false noses. Great observer and instrument maker who believed that the earth did not move. Hired Kepler as an assistant and died of overeating. |
| Kepler | 1571-1630 Tycho's assistant from a poor Protestant family. Came up with Laws of Planetary Motion |
| Newton | 1642-1727 explained graity keeps planets around the sun |
| Herschel | (1738-1822) Studied the milkey way and its sixe. Discovered Uranus |
| Tombaugh | Discovered Pluto. Died in 1997 when he was in his eighties |
