9781422281420

Where Are We? people have always wondered, “What is out there?” Looking at the night sky, For millennia , humans had only their eyes to look toward what was out there. (In fact, the idea of “out there” was controversial. Some early thinkers did not even believe there was an “out there” and that space was just a thin shell on the sky.) The idea that Earth was part of space was not truly accepted as a fact until the 1600s. Brave scientists such as the Italian Galileo Galilei (right) fought back against the “accepted” truth that the Earth was the center of the Universe. Instead, using observation,

Galileo, Tycho Brahe, and Johannes Kepler showed that our planet was just another body orbiting the Sun.

Stephen Hawking on formation of the Solar System

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