We learn more about the ultimate frontier every day, but the technology that allows us to explore the universe does not appear spontaneously. This list lists some individuals who have made the greatest contribution to space exploration and our understanding of the universe. I have arranged this list in chronological order.

1, Ptolemy -90- 168

PTolemaic

Ptolemy was one of the earliest astronomers. Based on his observation of the night sky, he developed the earliest known model of the universe. His model puts the earth at the center of several celestial bodies, and the sun, stars and other planets are fixed. His model is one of the earliest models to explain the "roaming" of planets in the night sky. His astronomical monographs "Grand Compilation" and "Four Constellations" catalogued 48 constellations, which provided an astronomical prediction table for future astronomers. Ptolemy's work laid the foundation for astronomy for more than 1000 years.

2. Nicholas Copernicus-1473- 1543

Copernicus

Copernicus's most famous achievement is that he developed one of the earliest models of the Heliocentrism universe. Heliocentrism model is a model centered on the sun. Copernicus mentioned Ptolemy's observation when developing his model. Copernicus' thought not only directly deepened our understanding of the universe, but also was regarded as the beginning of the scientific revolution. The scientific revolution has led to the development of almost all modern technologies and scientific knowledge.

3. Galileo Galileo-1564-1642.

"Galileo"

Galileo is regarded as the father of modern observational astronomy. Galileo had developed a telescope with a magnification of up to 30 times before completing almost all astronomy with the naked eye. He discovered Jupiter's four largest satellites with a telescope, observed sunspots, and confirmed the phase of Venus with his new technology. He also supported Copernicus' Heliocentrism model, although he was harassed by the Pope, the Spanish Inquisition and other astronomers for doing so. When Galileo was not observing the night sky, he studied the motion of objects. This work will be the pioneer of classical mechanics developed by Newton.

4. tycho brahe-1546- 1630.

Tycho Brahe

Tycho brahe was both an astronomer and a wealthy aristocrat. It is estimated that he once controlled one percent of Denmark's wealth. His abundant financial resources enable him to make scientific contributions to astronomy and provide a lot of money for the work of others. Blah has established many research institutions and observation stations. His observation was the most accurate in his time, and the median error was 1.5. His data will be used by his assistant johannes kepler later, and the fifth one is on this list. Interestingly, Tycho is famous for losing part of his nose. He replaced it with a gold or silver prosthesis.

5. johannes kepler-1571-1630

Kepler

Kepler is famous for describing the laws of planetary motion of planets around the sun. His three laws were later confirmed by isaac newton. His first and simplest law reveals that the orbits of planets around the sun are not completely circular as previously assumed. They are actually oval. An ellipse is an elongated circle with two focal points or foci. Each planet orbits the sun on an ellipse, which is located in one of two focal points. Kepler also invented an improved version of the refracting telescope, which Galileo used.

6. isaac newton-1642- 1727.

newton

Isaac newton's work in physics and mathematics is of inestimable importance to modern space knowledge. His three laws of motion constitute the backbone of physics and are one of the two great contributors to the development of calculus. Newton confirmed Kepler's laws of planetary motion and the Heliocentrism of the solar system. He also invented the first practical reflecting telescope. His work on gravity research will contribute to the development of astrophysics theory in the future. In short, from isaac newton's work, today's physics enables us to launch a payload into space and know what it will do when it reaches space.

7. robert goddard-1882- 1945

Robert H. Goddard

Goddard is called the father of modern rockets. He is undoubtedly a pioneer in his chosen field. In his research, he launched more than 34 rockets with a range of 2.6 kilometers (1.6 miles) and a speed of 885 kilometers (550 miles). He developed the first generation of liquid fuel rockets and the first stage of multi-stage rockets, and applied for patents. It is his research that makes modern space flight possible. Although his works are revolutionary, they have not been widely supported in his life, which makes him keep his works very secret.

8. Edwin Hubble-1889- 1953

Edwin Hubble

Edwin Hubble is most famous for his law of the same name "Hubble Law", which expanded the phenomenon of "redshift". "The redshift phenomenon is the most easily observed phenomenon in space, and the light from our light source will be transferred to the red end of the spectrum. The antonym of redshift is blue shift. This enables scientists to determine whether objects in the universe, such as galaxies and stars, are far away from us or close to us, and their flight speed. Almost all the observable galaxies have red shifts, which proves that the universe is expanding. The famous Hubble telescope is named after the Edwin Hubble telescope.

9. Werner von Braun-1912-1977

Werner Werner wernher von braun

Werner Werner wernher von braun is a rocket scientist, aerospace engineer and space designer. Many of the most important rocket technologies developed in the space race are attributed to Werner wernher von braun. After the war, he worked under Nazi regimes in Germany and the United States. During his stay in Germany, he developed a V-2 rocket for attacking London. After moving to America, he developed a medium-range ballistic missile. Although his weapon background is his love for labor and space flight. In cooperation with NASA, he is the chief designer of Saturn V rocket and the director of Marshall Space Center. Saturn V rocket powered the Apollo spacecraft and sent humans to the moon.

10, Elon Musk-1971year to date.

Elon Musk

Elon musk is the CEO and entrepreneur of Space X Company. His innovative business is to privatize the aerospace industry. The company aims to create the first reusable spacecraft, which is a revolutionary goal. Space X Dragon is the first private spacecraft to dock with the International Space Station. The only surviving member on this list; The full impact of his contribution has not yet been seen. However, if Musk can successfully monetize space flight, we may usher in a new era of space exploration and discovery.