Here are some people who have made discoveries that have advanced science in relation to the Universe. They are very numerous so we only put a few
Aristarchus of Samos, born in -310 and died in -30, is a precursor of Copernicus, he emits a theory that says that the Earth turns on itself in 24 hours. He goes even further by claiming that it also revolves around the Sun
Galileo, born in 1564 and died in 1642, is a mathematician, an astronomer and ecxelle in many other fields. However, there are mostly advanced astronomers. Indeed, he created one of the first telescope called Galileo's bezel created in 1609.
Ole Römer born in 1944 and died in 1710, experimentally demonstrates that light at a defined speed. He finds that this speed is equal to 212,000 kilometers per second