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 only have a tail and coma when they are close enough to the sun to heat... The U.S. National Aeronautics and Space Administration describes comets as consisting of a nucleus, coma and tail. Comets only have a tail and coma when they are close enough to the sun to heat... The U.S. National Aeronautics and Space Administration describes comets as consisting of a nucleus, coma and tail. Comets only have a tail and coma when they are close enough to the sun to heat up. NASA explains that the nucleus of a comet consists of ice, dirt, dust and other solid particles. When comets are far from the sun, they are dark and cold, with only a nucleus. The coma is a cloud of dust, gas and vapor that forms as the nucleus is heated.