What are these?
These are planets.
What is this?
This is the moon.
What is this?
This is the Sun.
What is this?
This is a galaxy.
What are these?
These are stars.
What is this?
This is a satellite. (What do satellites do?)
What is this?
This is an asteroid.
What is the astronaut wearing?
He is wearing a spacesuit.
What is he?
He is an astronaut.
What is the astronaut doing?
He's jumping.
What is this?
This is a telescope.
What is this?
This is a rocket.
What is this rocket doing?
The rocket is taking/blasting off.