We stick to Earth's surface without giving it a thought. Yet can anyone honestly explain gravity, the most far-reaching of nature’s four forces? Hear about the movement of the earth and Johannes Kepler's 400-year-old discovery.
We stick to Earth's surface without giving it a thought. Yet can anyone honestly explain gravity, the most far-reaching of nature’s four forces? Hear about the movement of the earth and Johannes Kepler's 400-year-old discovery.