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  1. ...386 billion billion megawatts of energy! Mercury is a small, rocky planet. Scientists think that there may be volcanic activity on Mercury...

  2. ...ice: Uranus and Neptune. Gas giants may have a rocky or metallic core—in fact, such a core is thought to be required...

  3. ...into two main types: large, low-density gas giants and smaller, rocky terrestrials.

  4. ... of the planets; the large number of asteroids (small rocky bodies) orbiting the Sun, mostly between Mars and ...

  5. ... most likely scenario is a dense core about 1700 km in radius, a molten rocky mantle somewhat denser than the Earth's and a thin crust. ...

  6. ... one of four terrestrial planets in the solar system, and is a rocky body like the Earth. It is the smallest planet in the...