Why is Uranus on its side?
Uranus was knocked off its axis due to a collision with another
large object passing through space . The object was nearly the size
All planets have a tilted axis. The Gravity of the Sun and other planets force the tilt.
The planets are always moving as they orbit the sun, so this answer keeps changing. For example, when Uranus and Neptune are on the same side of the sun, and Jupiter is on the opposite side, then Uranus and Neptune would be closest. However, if Neptune were on the far side of the sun, then Uranus and Jupiter would be closest. When Uranus and Neptune are at their closest, they're separated by (rough numbers) about…
It will vary quite consideraby depending on the position of each of the Planets. At one point, both planets will be on the same side of the Sun, and the distance will be quite small - astronomically - and at others, Uranus can be on the other side of the Earth at Aphelion, and the Earth on the opposite side of the Sun at Aphelion. So the distance will vary between. Closest: Earth at Aphelion…