The order of the planets:
Mercury, Venus, Earth Mars, Jupiter, Saturn, Uranus, Neptune, Dwarf Planets.
It depends on what heavenly body you talk about. If you talk about the planetary neighbor, that would be Venus (often called Earth's twin) in the closest distance of 38 million kilometers. If you talk about any heavenly body, it would be its own moon (officially called The Moon), being 221,463 miles as its closest distance from the Earth.
which civilization was closest neighbor
Tibet's closest neighbor is Nepal.
The closest southern neighbor would be Mexico.
USA is the closest southern neighbor of Canada.
Switzerland
Switzerland
mars
poutugal
op[[;']
.... well that depends on where you are....
Mexico
North Korea