The battle-cruiser played an active role as the main force of the navy.

The space probe discovered a new planet.

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.

The National Aeronautics and Space Administration announced a new space exploration plan.

The National Aeronautics and Space Administration announced a new space exploration plan.

The North American Aerospace Defense Command is responsible for the aerospace defense of North America.