This topic is very big like sky which has no limit i m giving u in short only helpful for highschool.
   Space - we cant explain the space it is so big from where it start and where it end, the emptyness between star is called space , it consist of lots of star planet galaxy astroid .
   Heavenly bodies- the star planet settelite astroid dwaf planet r heavenly bodies
 Moon is heavenly body which is very close to eart.
   Our solar system consist of 8  planet. the star  sun is present at the center of our solar system , which give light to our solar system, all other planet are revolve around the sun .
 Revolution - planet revolve around the sun is called revolution
 Rotation - planet rorate around it self is called rotation
  Eight planet - my very evil mother just swatted uncle nose
Mercury venus eart mars jupiter saturn uranus neptune
Settelite - revolve around planet  also called moon.