Why does gravity pull us down and not up? - Livescience.com

The reason gravity pulls you toward the ground is that all objects with mass, like our Earth, actually bend and curve the fabric of the universe, called space-time.

Space-time is exactly what it sounds like: the three dimensions of space — length, width and height — combined with the fourth dimension — time.

Using some very brilliant math, Einstein was the first person to realize that the laws of physics work in a universe where space and time are merged together.

What this means is that space and time are connected — if you move really fast through space, time slows down for you compared to someone who is moving slowly.

This is why astronauts — who are moving very fast in space — age a tiny bit more slowly than people on Earth.

When Einstein came up with general relativity, he showed that all stuff in the universe can curve space-time — in physics terms that stuff is mass and energy.

This is very similar to how the gravity of a heavy object — like the Earth — pulls things like you and me toward it?

That is why really massive things in the universe — like the Sun or black holes — have stronger gravity than Earth.

As far as scientists know, matter — or stuff — always makes gravity wells and not gravity hills.

Scientists can imagine things made of exotic matter or energy that would cause gravity to push you off into space, but so far, no one has found anything that could cause gravity to push you away from Earth.

When Einstein came up with general relativity, he showed that all stuff in the universe can curve space-time — in physics terms that stuff is mass and energy.

This is very similar to how the gravity of a heavy object — like the Earth — pulls things like you and me toward it.

That is why really massive things in the universe — like the Sun or black holes — have stronger gravity than Earth.

As far as scientists know, matter — or stuff — always makes gravity wells and not gravity hills.

Scientists can imagine things made of exotic matter or energy that would cause gravity to push you off into space, but so far, no one has found anything that could cause gravity to push you away from Earth.