Whenever the subject of mosquito control comes up, someone gives a fervent argument for installing purple martin houses and bat houses. Stores that cater to bird enthusiasts often tout the purple martin houses as the best solution for keeping your yard mosquito free.
A short period comet is conventionally defined as a comet having an orbital period of less than 200 years. What is the maximum possible aphelion distance for a short period comet with a perihelion of 0.5 AU? Where does this place the comet relative to the outer planets? (3)
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.