What is it?
the Earth
What is it?
space
What are those?
Stars
What is it?
the sky
What is it?
an alien
What is it?
the Moon
What is it?
a rocket / a space shuttle / a spaceship
What is it?
a comet
What is it?
the Solar System
What is it?
a meteorite
an asteroid
What is it?
a satellite
What are those?
planets
What is it?
a galaxy