The planet known as the "morning star" is Venus. It is often referred to by this name because it is frequently visible in the east just before sunrise. Venus is the second planet from the Sun and is similar in size and composition to Earth, often dubbed Earth's "sister planet." Its thick atmosphere is primarily composed of carbon dioxide, contributing to an extreme greenhouse effect that makes it the hottest planet in our solar system. The beauty and brightness of Venus have made it a subject of fascination for astronomers and casual observers alike.