He has a deep interest in astronomy.

Radio astronomy plays a very important role in understanding the universe.

Infrared astronomy provides a new perspective on understanding the universe.

A parsec is a unit of distance used in astronomy.

I will work using this laptop.

We walked a long distance.

What is the unit of measure for this product's weight?

He is using that coat from winter to spring.

You need to use your head to solve this problem.

He is world-famous as an astronomer.