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A set of photographs, taken by NASA spacecraft, of the eight planets and Earth’s moon

Images of the planets in our solar system taken by NASA spacecraft are grouped together to show (from top to bottom) Mercury, Venus, Earth and its moon, Mars, Jupiter, Saturn, Uranus and Neptune. Image Credit: NASA

      large round objects that revolve around a star

NASA has studied all the planets in the solar system.

Our solar system has eight planets.

More Information:
http://sse.jpl.nasa.gov/planets/profile.cfm?Object=SolarSys&Display=Kids   →