When you travel in one direction, it's a ...
one-way trip
There are millions of galaxies in the ...
universe
What is Milky Way?
It's a galaxy
How could people look at the stars and planets in the past?
through telescopes
It consists of the Sun, the 8 planets, dwarf planets, dozens of moons, and millions of asteroids, comets, and meteoroids. What is it?
Our solar system
What planet do we live on?
We live on the planet Earth
What do you call the air that surrounds Earth?
atmosphere
What does Earth orbit?
Earth orbits the sun
Who travels in space?
Astronauts
What do we send out to space for very long journeys?
unmanned spacecrafts