- ASTRONOMY is the study of objects and matter outside the Earth`s atmosphere and of their physical and chemical properties

-ASTRONOMY is the science which investigates all the matter-energy in the universe: its distribution, composition, physical states, movements, and evolution

- In simple terms...ASTRONOMY is the study of outer space and anything in it. Things like: the Solar system, galaxies, stars, comets, etc...

HOPE NOW YOU KNOW WHAT`S THIS "ASTRONOMY" THING! lol...