nasa
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Geological Activity Far out in the Solar System
Based upon the formation and evolution of the rocky terrestrial planets, size of the planet results in whether the planet is geologically active or dead. However, the moons of Jupiter, Saturn, and Neptune are smaller in size than Earth, yet… Continue reading
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Kepler’s Laws of Planetary Motion
After meticulously calculating the data that Tycho Brahe collected, Kepler discovered three different laws that described how planets move. Kepler’s First Law – The planets orbit in ellipses, not circles nor epicycles. For majority of history, it was thought that… Continue reading
Ah, the places we'll go! 
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