system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can astronomers see many distant galaxies but they don't know what's on outside of our own solar system?

The Oort Cloud is only hypothetical, yet we can see galaxies billions of light years away. I don't understand.
gpt
The Oort cloud isn't actually emitting any light, so there isn't anything for our telescopes to pick up on. Distant galaxies, on the other hand, are composed of countless stars as bright as or brighter than our own. Its the same reason you could see a lighthouse from miles away out at sea, but not your hand in front of your face in a dark room.