Astronomers inferred the existence of a local supercluster.

My father studies astronomy, or the science of stars.

He is an expert in astronomy.

He was a great authority on astronomy, or the science of the heavenly bodies.

It seems that he is interested in astronomy.

He studies astronomy, or the science of stars.

Astronomy is the science of heavenly bodies.

Astronomy deals with the stars and planets.

Astronomy is by no means a new science.

Astronomy is the science of the universe.

J. Kepler, astronomer and mathematician, made a study of planets and their movements.

During the Middle Ages, astronomers had clung to the theory of a Greek philosopher.

Many astronomers assume that the universe continues to expand forever.

Many astronomers assume that the universe expands infinitely.

The figure will be astronomical.

I learned much about astronomy from him.

What interests me greatly is astronomy.

Ancient astronomers noticed constellations and gave them names.

Ancient astronomers did not have instruments to help them see objects in the sky.

Maya priests learned much about astronomy.