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137,000 BCE
The Big Bang (13.7 billion BC)
The Big Bang is when everything was created. it started as a very small ball of extremely dense energy, heated up at trillions of degrees, then eventually gave way and exploded and created everything we know about the entire universe today. -
3100 BCE
Stonehenge
Stonehenge was the very first known man built structure. many people still don't know why it was built or why it exists, and there are many speculations. the most common theory is that it was built for uses of astronomy. -
Period: 384 BCE to 322 BCE
Aristotle
Aristotle was an ancient greek philosopher. He came up with the theory that all of the planets travel in seperate spheres. -
Period: 276 BCE to 194 BCE
Eratosthenes
A greek scientist who studied astronomy, geography, and math. He is most known for making the first accurate measurement of the size of earth. -
Period: 230 BCE to 230 BCE
Aristarchus
A greek astronomer and mathematician who created the first model where the sun is in the center of our universe, and not the earth. -
Period: 190 BCE to 120 BCE
Hipparchus
Hipparchus is considered the father pf trigonometry, and is most known for discovering the precession of equinoxes. -
Period: 100 to 160
Ptolemy
Most popular for creating the "Geocentric" theory. he took the movement and mapping of stars to come up with that the earth was in the center of the universe and everything revolved around it. Even know this theory was wrong, he is still known for his very good observations and creative thinking towards astronomy. -
Period: Feb 19, 1473 to May 21, 1543
Nicholas Copernicus
Created the heliocentric model, where the sun is in a fixed position in the universe, and all of the planets revolve around the sun in their own orbits. -
Period: Dec 14, 1546 to
Tycho Brahe
Was famous for making advancements in astronomy, such as creating instruments for measuring angles of stars and planets. He is also known for getting his nose cut off in a sword duel and wearing a gold and silver replacement. He also believed in the geocentric model of the universe, although it wasn't correct, he still made great observations and advancements for the time. -
Period: Dec 27, 1571 to
Johannes Kepler
Kepler is most popular for discovering the three laws of planetary motion, the first is that planets revolver around the sun in their own orbit, second, he also discovered that the farther the planet is away from the sun, the slower it will revolve. -
Period: to
Giovanni Domenico Cassini
An Italian mathematician, astronomer, and engineer. First one to discover on of Saturn's moons, and many other discoveries and projects. a spacecraft called Cassini that was named after him was launched in 1997. -
Period: to
Christiaan Huygens
a Dutch physicist, mathematician, astronomer and inventor. He was the first one to realize the true shape of the rings of Saturn, and came up with the wave theory of light. -
Period: to
Issac Newton
Sir Isaac Newton was a physicist, mathematician and astronomer. He has a big impact on the study of gravity, and how it works. He created the three laws of motion, and also his discovery of calculus has excelled math as we know it today. -
Period: to
Annie Jump Cannon
An American astronomer, Annie Jump Cannon discovered hundreds of stars and eventually classified hundreds of thousands of stars. -
Period: to
Edwin Hubble
An American astronomer, Edwin Powell Hubble discovered that there were distant clouds of light very far away, and discovered that those clouds of light are entire galaxies. He also found that the farther a galaxy is away from earth, the farther it moves away. A telescope was named after him in 1990. -
Period: to
James Van Allen
An American physicist, James Van Allen brought up new understanding to cosmic radiation and its effects. He discovered two zones of radiation circling earth, and we know them today as Van Allen radiation belts. -
Period: to
Stephen Hawking
Stephen Hawking is a world-renowned British theoretical physicist, known for his contributions to the fields of cosmology, general relativity and quantum gravity, especially in the context of black holes.
