What do we call this?
scientist
How do we call this?
space
What do we call this?
Earth
How do we call this one?
temperature
What do we call this?
experiment
What is this?
space station
How do we call this?
Mars
What is this?
planet
What is this?
spaceship
What do we call this one?
alien
How do we call this?
star
What do we call this?
astronaut
What do we call this?
gravity
What do we call this?
human
How do we call this?
the Moon
What do we call this?
oxygen