a person who studies stars and planets
astronomer
an air-like substance that moves around
gas
how far two objects or places are from each other
distance
to go in a circle around something else
orbit
to put something into a category
classify
loose, broken materials often made of rock
debris
how many planets are in our solar system?
There are eigth planets
which planet is closest to the sun?
Mercury
why did astronomers decide that Pluto wasn't a planet?
Pluto was too small to be a regular planet
what are the planets that are farthest away from the sun made of?
gas
what are asteroids?
Asteroids are space rocks that used to be part of other planets.
what is the name of our galaxy
Milky Way Galaxy
