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.

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.