This is a drawing of what the surface of a comet might look like.
Click on image for full size
JPL
The Comet Nucleus
A comet nucleus is the very center of the comet. It is solid and is
made of a special sort of dust which scientists call "fluffy". They call it fluffy because it is full of holes and could be very light.
At this point, scientists do not know whether the nucleus is very hard, like solid ground, or very soft, like a snowball.
Scientists are going to use the Rosetta mission to land a probe on the surface of a comet! This and other comet missions will certainly help scientists understand the very center of comets!
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