I dream of traveling through the universe someday.

Uchuu-kun, have you finished your homework for today yet?

This waste product needs to be properly disposed of.

The problem of space debris could potentially have a significant impact on future space development.

The study of cosmic rays may hold the key to unraveling the mysteries of the universe.

He proposed a new theory about cosmology.

He believes that aliens exist.

He is reading a book about space flight.

In philosophy, we consider ourselves a part of the macrocosm.

His dream is to do a space walk.