Copernicus:

Copernicus was an

astrominer which is

a type of scientist.

He was also a Priest

so when he discovered

that the Sun was in

the centre of the

Earth he didn't

straight away go and

tell because he

wouldn't be able

to be a priest

anymore.

Galileo:

Galileo was also an

astrominer like

Copernicus but was

not a priest and

was younger.

An astrominer is

some one who is part

of an astronomy, an

astronomy is a group

of people who study

stars. He only started

to study the proof

of what Copernicus

discovered when he

heard about it.