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.

His dream is to walk in space.

He is passionate about exploring his own innerverse.

His dream is to pilot a spaceship.

He is interested in the design of spacecraft.

He is excited about living in outer space.

He is majoring in astronautics.

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