Question

The gravity of earth is maintained by what ?​

Answer 1

Answer:

Gravity of earth is maintained by it's mass

Explanation:

Gravitational force is the Force between two bodies by the virtue of their mass

Answer 2

Answer:

Gravity is not the result of a process, like the water cycle for example. Gravity is an attractive force (like magnetism), that is a result of mass. Everything that has mass also have gravity, but gravity is a very weak force indeed, so unless something has a lot of mass, it has negligible gravity. Example; the sun has very much more mass than the earth, so the sun also has a gravity field very much stronger than the earth, hence why the earth is orbiting the sun and not the other way around.

In order for the earth to maintain its gravity, all it has to do is maintain its mass. This question therefore seems like it has a very simple answer indeed. But actually, it doesn't. The assumption of this question is that the gravity of earth is being maintained, i.e. Remaining the same. I don't think that's correct. We know that gravity is a result of mass, but is that mass constant? No, it isn't, so actually, earth’s gravitational field is either getting stronger or weaker depending on whether the earth is gaining or losing mass.

The current thinking is that earth is slowly losing mass. The earth gains matter via cosmic dust and meteorites, which bombard the planet daily, but it is also losing mass as the light gases in the upper atmosphere are eroded by the solar wind. No one knows for sure, but it seems that the earth loses more matter than it gains, resulting in a slow but steady net loss of matter (Is the earth gaining or losing mass over time?)

So the actual answer to the question is that earth does not maintain its gravity, the strength of the gravitational field is getting weaker over time. The assumption of the question is wrong.

I'm sure it's nothing to worry about, it will take billions of years for the earth to disappear as a result of its net loss of matter. The sun will turn into a red giant long before this (although the smoking cinder that the earth will become will still have its own gravity field as long as it remains whole.

Explanation:

HOPE IT HELPS YOU.