What's this?
It's a comet.
What's this?
It's a planet?
What's this?
It's a rocket.
What's this?
It's an astronaut.
What are they?
They are extraterrestrials.
What's this?
It's a galaxy.
What's this?
It's space.
What's this?
It's a solar system.
What's this?
It's an orbit.
What orbits the Earth?
The Moon orbits the Earth.
What does the Earth orbit?
The Earth orbits the Sun.
How many planets are in our solar system?
Eight planets are in our solar system.
What is your favorite planet?
______ is my favorite planet.
Do you want to be an astronaut when your grow up?
Yes, I do. / No, I don't.
What is the planet closest to the sun?
Mercury is the planet closest to the sun.
What is the biggest planet?
Jupiter is the biggest planet.
