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Eratosthenes was able to figure out the circumference of our Earth. This was very important to the study of space because the size of Earth helps us study all other things in our solar system.
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Ptolemy's catalogs were a great way to first keep track of the stars in the early ages. This allowed for other scientists to use this information to learn more about the solar system and stars in general
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This discovery was huge because it gave us a better look at our solar system and helped us understand more about it. This helped the Sun make more sense with our orbit.
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This invention was so important because it paved the way to studying stars in a new way. This helped in finding where stars were located and helped view how far away objects were in space.
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Kepler's laws allowed for planets' orbits to be studied on a closer scale. Scientists were now informed that planet orbits were in the shapes of ellipses and they were not perfect circles for the most part.
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Sir Isaac Newton is known for his discoveries about gravity on Earth. However, these discoveries also helped us understand gravity in space, and how it affects our planets. This is how we were able to figure out the Sun's gravitational pull and how we orbit it.
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Einstein's theory was very important to the study of space because it helped prove that the universe is continually expanding and doesn't just stop. This provided many explanations for many questions about the universe.