The planet once known as the "morning star" is Venus. This nickname stems from its bright appearance in the early morning sky, making it highly visible before sunrise. Venus is the second planet from the sun and is often referred to as Earth's "sister planet" due to its similar size and composition. However, its thick atmosphere and high surface temperatures make it uninhabitable. The mythological associations with the planet include various goddesses of love and beauty, further enhancing its cultural historical significance.