Astronomy definition

What is the meaning of the word astronomy?

as·tron·o·my. (ə-strŏn′ə-mē) n. pl. as·tron·o·mies.
1) The scientific study of matter and phenomena in the universe
Especially in outer space

Including :
The positions
Dimensions
Distribution
Motion
Composition
Energy

And evolution of celestial objects. 2.

What does an astronomer do?

Someone who studies or works in astronomy is an astronomer, and one of the main tools of the trade is the telescope. As telescopes get more and more powerful, astronomers learn more and more about what's going on out there, such as how old a star or planet is.

Astronomical object capable of nuclear fusion

Fusor is a proposed term for an astronomical object which is capable of core fusion.The term is more inclusive than star.

2006 International Astronomical Union definition