From Pluto the Sun looks only like a bright star in the sky. Pluto is a
cold and dark planet. Smaller than Earths moon. And consists of ice and rocks. It has a
thin atmosphere that forms when the planet is close to the Sun but freezes as it moves
away. Plutos orbit is tilted farther from the ecliptic than that of any other planet. One
orbit lasts 248.5 years and, for about 20 of those years, Pluto is closer to the Sun than
Neputne is. Some Astronomers believe that Pluto may, in fact, be a huge asteriod.
- Average distance from the Sun: 5.91 billion km (3.67 billion miles)
- Diameter at equator: 2,290 km (1,423 miles)
- Rotation Period: 6.39 Earth days
- Orbital Period: 11.86 Earth years
- Orbital Velocity: 4.74 km/s (2.94 mps)
- Cloud Top Temperature: -230 C (-380 F)
- Mass: (earth=1) 0.01
- Average Density: (water=1) 2.03
- Surface Gravity: (earth=1) 0.04
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