there are tiny particles in space and do collide with orbiting objects these suffer from orbital drag as the impacts and the tiny amount of atmosphere slow them down. This means that unless orbiting objects are fairly regularly boosted into a higher object they will fall back down to Earth, so before they can get “soot covered” they will be crashing back down to Earth.
Absolutely it would, they have to clean the ISS regularly to remove such, in space the physics are different and it’s a very different environment but dirt is dirt and dust is dust, it will eventually collect or land on some surface or another. Planets were made of a collection of mass dirt/dust/minerals ect at some point during it’s creation
When you sit in your house right now dust falls on flat surfaces because of gravity. This happens in space too. Anything that exists exerts gravity and will pull other things (dust or anything else) towards itself.
There is also one other thing at work too. Electricity. This works the same way that you can rub a balloon and then stick it to yourself. Same thing happens to small dust particles. Any particle that has a charge relative to you will be attracted to you and will stick to you.
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