Across
- 2. This person compiled the 3 Laws of Planetary Motion
- 4. According to Kepler's 3rd Law, square of time is proportional to cube of _______
- 6. This is tangential to the curved path
- 8. The shape of the path of each planet around the Sun
Down
- 1. Escape velocity is ______ than orbital velocity
- 3. The speed an object needs tobreak free of a plant or moon's gravity well and leave it without propulsion
- 5. No matter what type of orbit a satellite is in, mechanical energy is ______
- 7. Director of the world's first observatory