Question

what is planet. and what is a universe.what is cosmos

Answer 1

Planet:- A heavenly body that revolves about the sun
Universe:-The whole system of created things; the world; the cosmos ; everything that exists everywhere
Cosmos:- The world or Universes,in well- ordered system

Answer 2

The heveanly bodies that revolve around the sun on the own orbit is called as a planet. There are 8 planets in our solar system.
Sun, moon, planets, asteroids, meteorites, stars and everything including comets make our universe.
Comos is a complex and orderly system.

hope it helps!