It's not a belief, it can be proven true. When astronauts go to outer space they see Earth. They can take picture. People see those pictures. And sometimes satellites can take pictures, too.
Five ships commanded by Ferdinand Magellan left Spain and sailed southeast. They discovered a passage through the islands at the southern tip of South America, which is now called the Straits of...
It's a slightly flattened (at the poles) spheroid, the last time we checked. When astronomical bodies get large enough, they 'collapse', or shape themselves under the force of their own gravity....
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...