He is reading a book about space flight.

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

He is majoring in astronautics.

The theory of the multiverse is particularly interesting in the field of physics.

His dream is to walk in space.

His dream is to do a space walk.

He is passionate about exploring his own innerverse.

His dream is to pilot a spaceship.

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.