ELI5: Explain Like I'm 5

Micro-g environment

Micro-g environment is a feel of weightlessness, or less gravity, experienced by astronauts in space. When astronauts are in a spacecraft in outer space, there is much less gravity than on Earth, so they feel like they weigh much less or nothing at all. They experience some floating and spinning because of the lack of gravity. And this special kind of environment is called a micro-g environment.