What is astronomer definition?

An astronomer is a scientist who studies celestial objects such as stars, planets, galaxies, and other phenomena that occur in outer space. They use a variety of tools including telescopes, space probes, and computer simulations to observe and analyze these objects. Astronomers seek to understand the physical properties and behavior of celestial bodies, as well as the processes that govern their movements and interactions. They also work to expand our knowledge of the universe and its origins, including the Big Bang theory of the universe's creation. Astronomers often collaborate with other scientists such as physicists, chemists, and mathematicians to conduct their research.