Venus is a rocky terrestrial planet, and is the second closest to the Sun, named after the Roman goddess of beauty, this planet is anything but as it's surface is uninhabitble to life.
Venus has been known since prehistoric times. It is the brightest object in the sky except for the Sun and the Moon. Like Mercury, it was popularly thought to be two separate bodies: Eosphorus as the morning star and Hesperus as the evening star, but the Greek astronomers knew better. (Venus's apparition as the morning star is also sometimes called Lucifer.)
Since Venus is an inferior planet, it shows phases when viewed with a telescope from the perspective of Earth. Galileo's observation of this phenomenon was important evidence in favor of Copernicus's heliocentric theory of the solar system.
- (No date) Since this planet has always been seen in the early and late hours of the day, people has always known it existed.