Comets are like cats: they have tails, and they do precisely what they want.
David H. Levy (2003). “David Levy's Guide to Observing and Discovering Comets”, p.1, Cambridge University Press
![Comets are like cats: they have tails, and they do precisely what they want.](http://cdn.myquotes.org/images/david-h-levy/comets-are-like-cats-they-have-tails-and-they-do-precisely-what-they-want.jpg)
Comets are like cats: they have tails, and they do precisely what they want.