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I believe that Tycho Brahe had the greatest impact, he created measurements that were so exact that they are still used today. He also figured out the way the planets orbited and how the speed of the planets changed the perception of the sun from Earth. To me, he had a great impact sue to his want and need to explore outside not just in a lab with reading he wanted to show the world his findings.

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The importance of Galileo's scientific contribution to astronomy comes not from creating theoreticals, but by being the first to prove with physical evidence that prior theories - heliocentrism and elliptical movement, were accurate.

His pioneer use of the telescope inspired its future importance in astronomy and continued use in the modern day. He established factual information that we still use today, ex: sunspots, and provided a basis for future investigation by using similar means/methods to his. While prior scientific advancement allowed little interaction with space itself, the advancements during Galileo's time proved substantial. It is possible if he did not pioneer the use of the telescope in astronomy, it would not have been discovered for many years after. Additionally, he also insisted upon the heliocentric theory, his insistence and physical proof lending credibility to eventually establishing that theory as accurate. His work provided the necessary context to update what information we had and finally settle on an accurate model of the earth through other astronomers continued discoveries via telescope.

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Copernicus and Kepler gave the greatest contribution because Copernicus came up with the idea of the heliocentric model. Kepler proved that the heliocentric model was correct by making his 3 laws. He says that planets orbit in an elliptical orbit which explains why planets seem to move faster, slower, or backwards. He also has the law of harmonies, which says that the further a planet is from the sun, the longer it takes to orbit the sun. In conclusion, Copernicus came up with the idea and Kepler proved it.

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Kepler gave the greatest contribution to astronomy because his theories are still accurate, he was the first to find the elliptical orbit of planets, and he made three laws of planet orbit patterns. Kepler was also the first to find the elliptical orbit of planets around the sun based on two foci, one of which being the sun. This is also still factual today. Also, Kepler made 3 laws surrounding the planets patterns of orbit. His 3 laws had theories about what made the planets orbit elliptically and functions that could calculate speed. This was a very significant contribution towards earl astronomy. Overall, Kepler’s theories are the most significant contribution to astronomy.

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Galileo gave the greatest contribution to astronomy because he pioneered the use of the telescope to study space and he proved the heliocentric model. Galileo was the first to use the telescope to aid in astronomical research and his discoveries disproved the popular geocentric model. Galileo’s use of the telescope changed the game for astronomy. Without telescopes, we could never have gotten to the point of astronomical knowledge that we are at now. The telescope is a necessary tool for the basics of studying outer space. Additionally, the discoveries Galileo made with this telescope helped to disprove the geocentric model and provide evidence for the heliocentric model. The moons he discovered orbiting Jupiter proved that not all celestial bodies orbited earth, since these moons were clearly orbiting Jupiter. Finally, his discoveries helped to disprove the theory of celestial perfection. The sunspots and moon mountains he saw through his telescope showed that outer space was not, in fact, flawless. Based on these two reasons, Galileo had the greatest contribution to space history. Without him, we might be stuck staring at the stars from the ground with our naked eyes, instead of using tools to magnify them.

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Kepler gave the greatest contribution to astronomy because he discovered the planets were moving in ellipticals, he discovered that when planets are closer to the sun they move faster than when they are further away, and he discovered these things to prove that the sun is in the center of our universe. Without his three laws to describe the motion of the planet’s orbits around the sun we wouldn't be able to build upon his findings. Most people before him never had much serious improvement in proving that the sun was in the center of our solar system. However he discovered multiple things and came up with three laws to prove that the sun is at the center of the universe. When trying to discover why Mars’ orbit was so odd in comparison to the other planets that “revolve around the Earth” he found that Mars had been moving in an elliptical shape. This would later be evidence to support his theory that the sun was at the center of our solar system. I suppose you could credit Tycho Brahe because he was the one to give Kepler the task of figuring out Mars’ orbital path, but the real contribution to astronomy came from Kepler.

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Galileo gave the greatest contribution to astronomy because he was the first person to use the telescope to study our universe, identify that planets orbit the sun and prove Kelpler’s laws were valid.  He identified that Jupiter has moons, which would not happen if the earth was the center of the universe.  He proved that the  earth orbits the Sun.  He used the telescope to study our universe and made many discoveries, like sunspots, mountains on the moon and Jupiter’s moons.  His use of the telescope helped to make this a valid tool for studying the universe and space in general.

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I think Johannes Kepler made the biggest contribution to the history of astronomy. Firstly, he was one of the foremost defenders of the heliocentric model. He helped spur the debate on which model was correct, which allowed for more breakthroughs in astronomy. He was also the inventor of the three laws of planetary motion. Using these laws, he was able to create a much more accurate representation of the solar system. Because he based his model more specifically on mathematics, his model made less assumptions, and lead to a more simplistic approach to how the universe works. By further suggesting planets moved across elliptical paths, he cemented the model into mathematics. Because of Kepler, astronomy was able to advance much quicker than it would have without him. Kepler was a very important scientist of our history.

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Italian natural philosopher, astronomer, and mathematician who made fundamental contributions to the sciences of motion, astronomy, and strength of materials and to the development of the scientific methods.

Galileo was born February 15, 1564 and died January 8, 1642

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Galileo gave the greatest contribution to astronomy because he discovered the craters on the moon, sunspots, and four of Jupiter's moons. He discovered craters on the moon. Lots of people are interested in the moon’s craters. Along with that, he discovered sunspots. These sunspots are dark, and they show magnetic force. Lastly, he discovered four of Jupiter’s moons. This is important because he literally discovered moons. Lots of people know of these moons. They help the planet exist. Galileo gave the greatest contribution to astronomy because he discovered the craters on the moon, sunspots, and four of Jupiter's moons.