1. National Aeronautics and Space Administration
MERCURY
The smallest planet in our solar system Has a very thin atmosphere and no moons
The closest planet to the Sun Color: It has a dark gray, rocky surface
For more information about Mercury, visit: spaceplace.nasa.gov/all-about-mercury
Want to explore Mars for yourself? Check out our Explore Mars game at: spaceplace.nasa.gov/explore-mars
www.nasa.gov