Venus, the "jewel of the sky", was once know by ancient astronomers as the morning star and evening star. Venus, which is named after the Roman goddess of love and beauty, is coverd by thick swirling cloud cover. Astronomers call Venus Earth's sister planet. Both are similar in size, mass, density and volume. Both planets were formed about the same time.Venus is very different from the Earth.But it has no oceans and is surrounded by a heavy atmosphere composed mainly of carbon dioxide . Its clouds are composed of sulfuric acid.