That prospect turned me into a serious shopper for trip cancellation and interruption insurance (one policy usually covers both), a product I had always dismissed as a rip-off. Like other value-oriented consumers, I had seen no need to add several hundred dollarsâ worth of vacation insurance to the price of a vacation. Until that trip. Since then we have insured a couple of other trips, but never needed to make a claim. The only time we came close was in the wake of 9/11.
Comet Facts. Comets, like asteroids, are small celestial bodies that orbit the Sun. However, unlike asteroids, comets are composed primarily of frozen ammonia, methane or water, and contain only small amounts of rocky material. As a result of this composition comets have been given the nickname of dirty snowballs..
Comets Comets have a very small nucleus, a coma of gas and dust that is the most visible part and can be very large, a hydrogen envelope, a dust tail, and an ion tail. Comets ï§The cometâs tail always points away from the Sun, driven by the solar wind and radiation pressure. ï§ Comets have very eccentric orbits. ï§ Long-period comets (C/) have periods of hundreds of thousands, or even millions, of years. ï§ Short-period comets (P/) are less common, and have periods of less than 200 years.