Venus is known as the Earth' "twin" because the planets are so like each other in size. The diameter   of Venus is about 7,520 miles (12,100km), about 400 miles (644km) smaller than that of the earth. No other planet comes closer to the earth than Venus. At its nearest approach it is about 25,000,000 miles (402,000,000km) away.
As seen from the earth, Venus is the first planet or star that can be seen in the western sky in the evening. At other times, it is the last planet or star that can be seen in the eastern sky in the morning. When Venus is near its brightest point, it can be seen in the daylight. Early astronomers called the object that appeared in the evening Hesperus, and Phosphorus in the morning. Later they realized these two objects were the same planet. They named it Venus in honor of the Roman goddess of love and beauty.
Venus is called the earth's "twin" because   _  .
it's almost as big as the earth it's the nearest to the earth they are both planets they are of the same shape