He behaved in an unfriendly manner.

He is often thought to be an unfriendly person.

This company has decided not to pay dividends again this year.

He is infected with the coronavirus, but he is asymptomatic.

It has been a while.

Cosmic background radiation is considered evidence of the Big Bang.

Astrobiology is a very interesting field of study.

He is majoring in aerospace engineering.

The space probe discovered a new planet.

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