An asteroid
The Moon.
The Earth
Rocky.
The most common rocky objects in space are asteroids. An asteroid can range from a small rock to known sizes of hundreds of kilometers in diameter.
Its gravitational field protects the inner rocky planets from comet bombardment
One object that's currently getting a LOT of attention is the newly discovered Comet ISON, which will make a VERY close pass near the Sun in October, 2013. If Comet ISON survives the encounter - a VERY big "IF"! - then it will probably pass not too far from the Earth and become one of the most impressive comets of the last 300 years. No guarantees, of course, since this is probably Comet ISON's first pass near the Sun; we have no idea what quantity of volatile chemicals and frozen gasses may be in the comet. If it turns out to be mostly rocky, then this could be a bigger flop than Comet Kohoutek.
No. The other terrestrial planets likely have metallic cores similar to Earth's. The gas giants likely have rocky cores.
# It's a moon # A rocky planetoid # airless # celestial object
ASTROID!
It is kind of rocky
It is most likely made of ice with a rocky core, much like a comet.
meteoriods are most likely rocky firballs and when they fall to earth they come as dust