0 someone who studies astronomy
1 a person who studies astronomy or whose job is connected with astronomy
Astronomers call it mass transfer, and it happens when one star pulls away the mass of the second star.
Astronomers, the scientists who study space and planets, decided that Pluto was too small and too far away from our sun to be called a planet.
Herschel, a British astronomer born in Germany in 1738, spent hours in his workshop, building mirrors for his telescope.
In 1783, English writer and astronomer, John Michell, guessed that there were black holes.
In 1960, a young radio astronomer named Frank Drake started the first search for signals from other solar systems.
Recently, astronomers watched a star falling into a black hole.