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)
Halleyâs comet belonged to the Neptune group and today falls into the short period comet category. In the early twentieth century these were called âPeriodic comets.â At the time, what we now call long period comets were thought to be from beyond the solar system.