system
Given the following post, respond as if you're commenting on Reddit:
human
What kind of experiments are the astronauts doing on the ISS?

Are they doing astronomy, weather science, or just seeing how things act without gravity?
gpt
The short answer is that they do all of those things. With every supply load going up to the ISS they get lots of stuff that people back on earth wants them to do experiments with.

A lot of them has to do with how we as a humans will handle living in space for longer periods, which will happen if we are to colonize Mars for example. And that is why they do such experiments as testing the grip strength of mice to study how your muscles atrophy.

But as you said it's a lot of studies on how physics behave in a micogravity environment to be able to see if there are things that can be done in space that can't be done on earth.