- How did Copernicus, Tycho, and Kepler challenge the Earth centered model?
- What are Kepler's three laws of planetary motion?
- How did Galileo solidify the Copernican revolution?
- How can we distinguish science from nonscience?
- What is a scientific theory?
- In what sense is the moon imperfect?
- Why did Kepler use ellipses instead of circles?
- When was Tycho Brahe born?
- When was Johannes Kepler born?
- When was Galileo Galilei born?
The moon has impact craters and volcanic maria
Kepler used ellipses, because Mars orbit could not be fitted with Brahe's data
Tycho Brahe was born on December 14, 1546
Johannes Kepler was born on December 27, 1571
Galileo Galilei was born on February 15, 1564
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