What do astronomers study and what tool are used

According to NASA, modern astronomers' tools include advanced telescopes capable of studying light reflected from the sun, moon, planets, comets and stars. Radio telescopes are utilized in the study of radio waves, while space-borne gamma ray telescopes aid in the study of gamma rays.

Astronomy is the science of the study of planets stars and other extraterrestrial body's in outer space they will often use things like telescopes and electronic equipment as like but can use the hubble telescope as well