It is quite common for small meteors to hit the Earth. Larger impacts by an asteroid or comet are also possible but happen much less often.
the ball will go on forever unless it hit another object
The Moon is the nearest natural object to Earth in space.
No, the mass density of an object would not be the same on the moon as on Earth. The mass of the object would remain the same, but since the gravitational pull on the moon is weaker than that on Earth, the volume of the object would decrease on the moon, resulting in a different mass density calculation compared to Earth.
The only way to change anythings gravity is to change its' mass. (apex) Increase the mass of the object Decrease the distance of the object from Earth
Simple. Weigh it
the ball will go on forever unless it hit another object
An asteroid would hit earth first
The Moon is the nearest natural object to Earth in space.
Hitting or getting hit by something as small as an earth sized planet would have no effect on the size of a blue giant. I doubt that the planet would survive as a solid body long enough to actually make contact with such an object.
If the sun hit the earth we would be all dead.
It is called a meteorite
An asteroid
No, the mass density of an object would not be the same on the moon as on Earth. The mass of the object would remain the same, but since the gravitational pull on the moon is weaker than that on Earth, the volume of the object would decrease on the moon, resulting in a different mass density calculation compared to Earth.
the earth would be destroyed
The strong force will hit the object and may or may notmove it depending on what the 2 objects are. An example would be if the strongest force was the sun and the unmovable object was the earth then the planet would burn up and we would all DIE.
When a Mars-sized object hit the Earth.
Because, either we happen to be in it's way, or the object is pulled in by Earths gravitation field.