Question: how does space affect human lives is it anything to do with astronomy

Reka Nagy answered on 10 Nov 2016:

If you’re talking about how space affects humans who are in space, then it has all to do with biology! There are currently studies underway looking at how humans can live in places with no, or little, gravity – our bodies have adapted to Earth’s gravity over thousands of years, so if you remove this gravity, it can have some pretty bad consequences.

For example, in gravity your bones and muscles need to work to hold you upright so you don’t collapse – but without gravity, they do not need to do this. This is why astronauts who are in space need to exercise a lot each day, to maintain their muscle strength as without this exercise, muscles quickly begin to weaken.

On Earth, blood tends to pool in the feet, so blood pressure here is higher than the blood pressure in the head. In space, this difference in pressure vanishes, which is why astronaut’s faces look puffier while their feet look thinner. It also confuses the brain, making it think the body has too much blood – so it starts sending signals to get rid of this “extra” blood – due to this, astronauts can lose as much as 20% of their blood within a few days! With less blood to pump, the heart will also weaken.

If you plan on staying in space forever, these changes may not be that bad. But most people want to eventually return to Earth so they need to make sure that the will be okay when they return to gravity.