Halley's Comet's nucleus is very dark and looks like a large potatoe. The comet it's self is from what i believe 99% hydrogen and 1% oxygen. The nucleus has very many craters on it and the comet goes into the Kuiper Belt and orbits around the sun every 76.09 years. As a bonus we will see the comet again in the year 2062.
Yes.
Yes, there are many comets other than Halley's comet. Comets are icy bodies that orbit the Sun and often have elongated orbits that bring them close to the Sun. Some well-known comets include Hale-Bopp, Comet NEOWISE, and Comet Lovejoy.
A cloud of gas surrounding the nucleus.
The comets got hot quickly.
Nucleus coma tail
Halleys Comet is by far the best known. The second is harder to determine - Hale-Bopp and Comet McNaught are known at the moment amongst the general public.
1-nucleus 2-coma 3-tail
Bob is looking for comets
Comets are called this because of the ice and dust inside the nucleus. Now go look up everything else on your own.
particle
Dust particles
You don't need to; the Sun does a fine job of vaporizing the volatile chemicals in the nucleus of a comet.