How big are comets and asteroids?
Anywhere from the size of pebbles (1 cm) to gigantic rocks that rival some of the moons of other planets for size (1000 km diameter)
Typically, asteroids are silicates (rocks) and water (in the form of ice), which is pretty much the same stuff that comets are made of, except that the big, beautiful comets are mostly water, and the asteroids are mostly rock. Asteroids may also have some metals and someday these may be commercially valuable.
While asteroids and comets have different constitutions - asteroids are mostly metals and rocks while comets consist of water-ice, dust and rock - with comets potentially being potentially less dense, comets travel much faster than asteroids. An asteroid may travel upwards of 40,000 miles per hour, a comet travels over 150,000 miles per hour.
The Minor Planet center has cataloged 279,722 minor planets which are asteroids, comets, and dwarf planets. Considering asteroids and comets are in some ways related bodies in the fact that they do not have hydrostatic equilibrium; we only have to subtract the four dwarf planets leaving us with 279,718 asteroids and comets discovered so far.
Comets simply means asteroids coming from the asteroid belt between mars and jupiter. When comets get close to the sun they get disintegrated and destroyed by the sun"s heat itself I don't believe the above answer is correct. Asteroids and comets are not the same thing. While asteroids come from the asteroid best, most comets come from the Oort Cloud or Kuiper Best, far beyond Neptune. They are also made up differently - comets being…