they would of found out about asteroids because when the dinosaurs were extinct a massive comet hit earth and it destroyed it and the reason planet earth was created again was because a large enough rock formed into a planet and if the rock is not large enough then it wont form into a planet
You can find asteroids in a asteroid belt.
scientific method
We can find asteroid in mesosphere. It is the outermost layer.
observation
scientific method
it's because that they were asteroids that was bigger then Pluto so it was hard to find out which is Pluto and which are the asteroids
Parallax is a method used to find the distances of stars.
Between mars and Jupiter
find it your self you will learn somting
The asteroid belt, which consists of millions of individual asteroids, is located between the orbits of Mars and Jupiter.
Mass
The scientific method.