Uranus and Neptune are a long way away.
Think of it this way; Uranus is four times the diameter of Earth, yet so far away that even under the very best of circumstances it’s barely visible to the naked eye. Neptune is just a hair smaller than Uranus, but at half again farther away yet you need binoculars at least to spot it.
In real numbers Uranus is about 3 billion kilometers away, Neptune 4.5. That’s a lot of kilometers.