Uranus
Mercury is the closest planet to the Sun and due to its proximity it is not easily seen except during twilight.
For every two orbits of the Sun, mercury completes three rotations about its axis and up until 1965 it was thought that the same side of Mercury constantly faced the Sun. thirtheen times a century mercury can be observed from Earth passing across the face of the Sun in an event called a transit.
Uranus Facts
- Diameter: 4,879 km
- Mass: 3.29 x 10^23 kg (0.06 earths)
- Moons: None
- Orbit Distance: 57,909,227 km (0.39 AU)
- Orbit Period: 88 days
- Surface temperature: -1737deg; to427°C
- First record: 14th century BC
- Recorded by: Assyrian astronomers