Gravity.
The Ptolemaic system belived that the earth was the center of everything and all the planet and sun traveled around it and the copernican system belived that the sun was the center of everything and the planets and traveled around the sun.
There is nothing special about the center of the Earth itself; the attraction is in that direction, due to the accumulated effect of the attraction from different parts of the Earth. At the center of the Earth itself, the gravitational attraction towards the left, for example, by some pieces of planet Earth, would be exactly compensated by gravitational attraction towards the right, by other pieces of the planet.
Moons orbit planets. Planets orbit stars. Some stars orbit other stars, or orbit their mutual center of gravity. Stars orbit the center of the galaxy. Galaxies may orbit the center of the "galactic group".
The planets orbit the Sun. The Sun is at the center of our solar system and does not move.
The theory that the Sun is in the center, and the planets orbit around it.
you
gravity
he said the earth was the center of the universe and everything revolves around it
gravity is the force that pulls everything down towards the centre of the earth.
He studied the planets and the sun most of all. He wanted to discover if the sun truly was the center of everything. He studied and studied until he realized the sun is at the center.
The Ptolemaic system belived that the earth was the center of everything and all the planet and sun traveled around it and the copernican system belived that the sun was the center of everything and the planets and traveled around the sun.
The center point in a thing causes a pull towards everything around it.
It maintains the distances between planets.
There is the Mount Royal on the center of the island, and everything kind of goes down towards the water on each side.
There is nothing special about the center of the Earth itself; the attraction is in that direction, due to the accumulated effect of the attraction from different parts of the Earth. At the center of the Earth itself, the gravitational attraction towards the left, for example, by some pieces of planet Earth, would be exactly compensated by gravitational attraction towards the right, by other pieces of the planet.
Gravity.The gravity of the earth is always pulling everything towards it. Nothing can fall off the earth because everything wants to fall towards the center of the planet.Even the moon is being pulled towards the earth. That's the only thing that keeps it from drifting off into space.
bounce off planets towards center, create some cities. When close to center you have to fight Grox. Don't try to go around they surround it, just colonize them all when you take over. You can also use wormholes, but they are unpredictable.