The Solar System

Venus

Earth’s near-twin in size, under thick clouds of sulphuric acid. At 465 °C its surface is the hottest in the Solar System.

Venus
Venus wrapped in its bright clouds, from the Mariner 10 spacecraft, newly reprocessed. Credit: NASA/JPL-Caltech, Public domain (NASA).
Size
12,104 km across. About 95% as wide as Earth.
One year
225 Earth days
One day
117 Earth days, and it spins backwards
Moons
None
Spacecraft
Soviet Venera landers photographed its surface; Magellan mapped it by radar through the clouds.

Sizes and periods from NASA’s planetary fact sheets; moon counts from NASA Science.