No, there is no gravity gradient.
Though it could be if it was somehow mounted in a centrifuge.
All the time. (The moon is actually orbiting around the Earth, which is orbiting around the sun)
No. Other stars have been found to have planets orbiting them.
They were orbiting or looking around to see what was around the Earth and they saw the moon an claimed it ours?! Well that's my guess
a moon
The force of gravity causes the moon to orbit the Earth, and the Earth to orbit the sun.
Planets do not have suns orbiting around them. Suns have planets orbiting around them. The planet in our solar system with the highest number of discovered moons orbiting around it is Jupiter, with over 100.
It varies greatly. It will depend on how far away it is from the object it's orbiting. If it is in a circular orbit around the Earth, its speed can be calculated by the formula: speed = Squareroot(398600/(6371+altitude)) This will give you an answer in kilometers per second.
All the time. (The moon is actually orbiting around the Earth, which is orbiting around the sun)
around mac 21
The Knowledge regarding laws of pendulum started from Galileo around 1600 A.D.
No, there are not.
The large lump of rock orbiting around the earth is called the moon
No. Other stars have been found to have planets orbiting them.
ball spinning on its axis- rotation ball spinning around the head- revolution/ orbiting
They were orbiting or looking around to see what was around the Earth and they saw the moon an claimed it ours?! Well that's my guess
An ellipse.
orbiting =D