Since then he was doing a research work in astronomy.

During his second year at the university he took a course in astronomy.

He was, however, quite well read, with a strong interest in astronomy.

From a young age he showed an interest in science and astronomy.

He developed an interest in astronomy at an early age.

The system is so named due to its use in astronomy.

He developed an interest in astronomy from an early age simply by going outside and looking at the stars.

I don't know whether any of them were later interested in astronomy.

People often ask me how I became interested in astronomy.

By this age, however, he had developed a strong interest in astronomy.