By astronemers they are regularly sighted and tracked. The general public rarely sits gazing at th cosmos in a modern world. they are not seen because people dont always look up at the sky
they have long elliptical orbits
There are no comets that orbit the planet Mars. Comets, some, orbit the sun. Mars on the other hand does have two moons, Phobos and Deimos.
over 5,000
Many cultures have superstitious beliefs about comets and asteroids. The Philippines do not seem to share superstitions of comets and asteroids.
Shut up 7
A few MILLION!
they have long elliptical orbits
There is no set number, because new comets are discovered all the time. Not all comets that are discovered will be visible with the naked eye.
There are no comets on Neptune because Neptune is a planet and comets are, well, comets. They have nothing to do with each other.
6
36 years
3 years
Many astronomers have discovered that many comets. For example, David Levy is the discoverer or co-discoverer of 22 comets.
Last sighting was by E. Loder in 1894 though this statement can be highly debated upon.
11
18
114
1500