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Unformatted text preview: This gives up a way to measure mass: Observe the orbital period and distance. Use these to determine mass of planets and moons. CD: You may want to look at the force of gravity animation. in the 2nd edition Chapter 2 Gallery of the CD (p.1) in the 3rd edition: under animations in Gravity and Motion (Astronomy Basics) Escape Velocity escape velocity is the speed needed for an object to escape from the force of gravity escape velocity depends on: mass of the planet (or moon) o more mass => need higher speed to escape size of planet (or moon) o larger radius => need less speed to escape We will use this later to study the atmospheres of planets and moons....
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- Spring '10