In the Solar System
Neptune
The furthest planet, four and a half billion kilometres out, and the only one found by arithmetic before anybody looked: its position was worked out from the way it was pulling Uranus off course. It has the fastest winds in the Solar System, over 2,000 km/h, and Triton - a moon going round it backwards, which means it was captured, and which vents nitrogen at −235 °C.
- Radius
- 24,764 km
- Turns once in
- 15 h 58 m
Everything the map shows is worked out in your browser from published orbital data - nothing on it is a stored picture of where things were.