What is the distance between Earth and Neptune in Astronomical Units?
This question is quite difficult to answer, as the Earth and
Neptune's orbits are constantly in progress at different speeds,
and vastly different distances from the Sun, which changes the
distance between the two objects.
The average distance between the Sun and Neptune is 30.06 AU.
The Earth is exactly 1 AU from the Sun, so if all three objects
were in conjunction (aligned with each other), with the Sun at the
end, Neptune would be approximately 29 AU distant from Earth. If
all three were in conjunction with the Sun in the middle, the
distance between Earth and Neptune would be just over 31 AU.
We can say, then, that the distance between Earth and Neptune is
between 29 and 31 AU, depending on their position relative to the
Sun and each other.