posted on Apr, 13 2011 @ 08:11 PM
Actually a comet's coma is what hides its size to our observations sans sending a spacecraft to its interior, or its nucleus, or its solid mass. The
coma obscures a comet's size, a coma grows as it approaches the sun, its the mystique of comets and probably the source of the mystery some try to
fill with fantasy.
The difference between a comet growing a huge coma and one growing a long tail gives us clues as to the geological makeup of the comet and possibly
its age, and/or its orbital periods. Serious study of comet's structure is really at its infancy, we have a lot to learn about these mysterious
travelers, I mean space debris from accretion of solar systems and interstellar space.