Isaac Newton, Gravity, and Orbits. Astro : Chapter 3-5. The birth of modern astronomy and of modern science dates from the 144 years between Copernicus’ book (1543) and Newton’s book (1687).
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Astro: Chapter 3-5
object, the more
gravitational pull it
exerts on all objects
1. An orbiting object is actually falling (accelerating) toward the center of the body which it is circling.
If in a stable orbit, the orbiting object continuously “misses” as it is also moving forward as it falls, due to its tangential speed.
2. Objects orbiting each other actually revolve around their mutual center of mass.
3. There is a difference between open and closed orbits
Open Orbit (unbound): an orbit which allows the object to escape returning to its original starting point.
Closed Orbit (bound): an orbit which returns the object to its original starting point.