Here is the description from Wikipedia:

>First described in 1950 by the Dutch astronomer Jan Oort, is a theoretical concept of a cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from 2,000 to 200,000 AU (0.03 to 3.2 light-years).

https://en.wikipedia.org/wiki/Oort_cloud

All of it Nobody has seen it. They don't have proof that it is really there.

It won't take much. The Voyagers aren't even one light day away yet, it will be a very very long time before they are anywhere close to a light year away.

They did something like that at Epcot in Disney world. It was in the Universe of Energy building I think. They took you to the time of the dinosaurs and you could smell the sulphur in the air.

That is great for your story, I guess. Real life odds would be less than a one in a billion chance for it to happen though.

https://en.wikipedia.org/wiki/Asteroid_belt

Even in the asteroid belt, the asteroids are so far apart that you are unlikely to even see one, let alone have one hit you. Space is really big and mostly empty. The Voyager probes have been travelling through space for decades with no repairs and are still doing fine.