There are so many people studying about the Solar System and the whole universe!...
Astronomy
stars are called heavenly bodies
scientists call stars heavenly bodies
Astronomy or Planetary Science
Yes, they do.
Heavenly bodies, by their very definition, are not "in the world" - they are in the heavens - that is, they are out of this world. Heavenly bodies include the Sun, the moon, the planets of the solar system and other stars and their planets. They are - literally - too many to count.
Telescopes and the naked eye (not very effective).
A group of heavenly bodies is called a solar system. Heavenly bodies are the stars, planets, comets, asteroids, and moons of a solar system.
The heavenly bodies on the universe are anything that is found in the skies and is placed there by nature. Some of the common heavenly bodies include comets and stars.
Asteriods and meteors. everything you see in the night sky is classed as a heavenly body, planets, stars, moons and galaxies
seven
dust, soil, meteoroids, asteroids, rocks, may be other stars and universal heavenly bodies