- Mercury does not have any moons or rings. Mercury has a diameter of 4,879 km, making it the smallest planet. A year on Mercury takes 88 Earth days. Quick Mercury Facts. A day on the surface of Mercury lasts 176 Earth days. Your weight on Mercury would be 38% of your weight on Earth.[1]
Mercury
- Venus is named after the Roman goddess of love and beauty. Venus has no moons nor rings. Venus is sometimes referred to as the “morning star” and “evening star”. One day on Venus is longer than one year. Venus is sometimes called Earth’s sister planet. Venus is the second brightest natural object in the sky.[1]
- The Earth is around 4.6 billion years old according to scientists. The Earth’s atmosphere is composed mainly of nitrogen (78%), oxygen (21%), argon (.93%), and carbon dioxide (0.03%). The Earth is the densest planet in the Solar System.[1]