Mercury: The Sun's Swift Companion
Mercury is the closest planet to the Sun and the smallest in our Solar System. Despite its proximity, it's not the hottest — that title belongs to Venus!
Fast Facts about Mercury
- Orbital Period: 88 Earth days
- Diameter: 4,880 kilometers
- No atmosphere to speak of; temperature can swing from -173°C at night to 427°C during the day!
- Named after the Roman messenger god, Mercury. 🏃♂️
Learn More
Check out more about our celestial neighbors: