We have moved with our children to the planetarium and explained so many mysterious objects.
Everyone knows that the sky doesn’t move. The earth rotates around the sun. The earth being in a different spot in its’ orbit all the time gives us different stars to see at different times out of the year.
A star is a huge ball of glowing gas in the sky. The Sun is a star. It is the only star close enough to the earth to look like a ball. The other billions of stars are so far away that they are no more than a pinpoint of light. A constellation is a bunch of stars in the sky that form a picture.