Can gravity be artificially created?

A. 1

I heard weightlessness is possible.
I heard that astronauts practice in the space they made.

Gentleman 8 years ago 0

OK

A. 2

Don't astronauts usually practice underwater?
It's similar to zero gravity.

Gentleman 8 years ago 0

OK

A. 3

Gravity grows when a very high-mass material is next to it.
You can't build that mass in a lab

Gentleman 8 years ago 0

OK