Why is the Earth's or other planets orbit elliptical instead of being circular such as of moon?
38265
Why don't planets have Circular orbits?
60711
What provides the centrifugal force for planets orbiting a star?
73038
Why does a body always rotate about its center of mass?
41230
What is the simplest way to prove that Earth orbits the Sun?
73931
Why did the original-Earth have continents that resembled the ones on the final-Earth?
75326
Why doesn't the moon crash into the Earth?
29994
Why are some galaxies flat?
37062
Would it matter if the Earth rotated clockwise?
87509
Why is the 'straight line' path across continent so curved?
154466
What are common methods for calculating the time dependency of elliptical orbit?
62808
Vertical uniform circular motion.. can it really be uniform?
17126
Significance of the second focus in elliptical orbits
97768
Why is $R\cos{a} = mg$ in circular motion compared and not $R = mg\cos{a}$?
53096
Is sun revolving around certain mass in space with reference to some other galaxy?
76423
Why is the total energy of an orbiting system negative?
51738
How do the Planets and Sun get their initial spin?
95940
Conservation of angular momentum in a planetary system