He is an expert in astrophysics, and his research is highly valued around the world.

My dream is to become an astronaut.

Astrobiology is a very interesting field of study.

Cosmic background radiation is considered evidence of the Big Bang.

He is majoring in aerospace engineering.

He stirred the fireplace fire with a poker.

I can't find my Allen key.

This is my unused camera.

I shop at the nearby grocery store every Saturday.

This painting is my most precious item under heaven.