Earth science is an important field of study for unraveling the mysteries of nature.

I am an Earthling.

We are searching for extraterrestrial life.

The process of terraforming is part of transforming other planets into a habitable environment for humans.

Under the moonlight, his silhouette was projected onto the wall.

Chikage is my best friend.

He is completely nowhere to be seen.

He has changed so much that he is a mere shadow of his former self.

Kageichi is my best friend.

Kageji is my best friend.