How did planets have an elliptical orbit in the first place?
2305
Why are orbits elliptical?
14915
Story about lost colonized planet sent into orbit around "free" star
154466
What are common methods for calculating the time dependency of elliptical orbit?
82256
Conservative central force and stable orbits
155774
How does Newton's first law asserts the existence of inertial frames?
41993
Why are stars, planets and larger moons (approximately) spherical in shape (like, the Sun, the Moon, the Earth, and other planets)?
2872
Kepler problem in time: how do two gravitationally attracted particles move?
17126
Significance of the second focus in elliptical orbits
154880
Historic reasons for Left-Handed Coordinate System
73931
Why did the original-Earth have continents that resembled the ones on the final-Earth?
11683
Why does the atmosphere rotate along with the earth?
33047
Why do we say that the Earth moves around the Sun?
51738
How do the Planets and Sun get their initial spin?
51988
What made us think that Earth moves around the Sun?
73776
Eccentricity of an ellipse
96744
Under which conditions do two moving bodies start orbiting each other around their center of mass?
81530
A simple explanation of Kepler's Third Law