The asteroid belt. All of the above are sources of comets. The nucleus of a comet is best described as a dirty snowball. The gas tail of a comet is ionized gas that is blown by the solar wind. The dust tail of a comet is made of rocks up to several meters across.
Comets spend most of their time well outside the inner solar system.
The ion tail of a comet always points directly away from the sun, regardless of whether the comet is approaching the sun or receding away from the sun. All of the above. Describe the asteroid Vesta. Briefly describe the development of a comet as it approaches the sun. Describe the Kuiper Belt, what is it, where is it and what is in it.