Astronomers use an auditory up on a hillside, and away from cities and pollution. So what i'm trying to say is that astronomers use an auditory to study the components of the universe.
people who study about the universe are called astronomers
Cosmologists.
Cosmologists
astronomers
Astronomers, physicists
They are called astronomers.
they use tools.
Cosmic Background Radiation
A person who is involved in the astronomical study of sun is called a Heliologist
if the universe is bounded or not
if the universe is bounded or not
radio waves. Of course they also use very big optical telescopes.