Photo of Earth, taken by the russian weather satellite "Electro-L", 36,000 kilometers above the equator.
Imagen que muestra la proporción de agua salada y agua dulce del planeta Tierra.
Venus is one unique planet when it comes to rotational motion. It takes Venus 243 Earth days to completely rotate on its axis, but just 225 days to orbit the sun. Venus also is one of two planets that rotates in reverse, a phenomenon called retrograde motion, which according to most theories is due to an ancient planetary collision.
Auroras occur on other planets as well. Similar to the Earth's aurora, they are visible close to the planet's magnetic poles. Astronomers have spotted the lights on Jupiter, Saturn, Uranus and Neptune.