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384 BCE
Aristotle
He proved that Earth is round and it is in the center of the universe,and sun,moon,and stars where attached to spheres and rotated around the earth. -
190 BCE
Hipparchus
Discovered the precession of the equinoxes.He calculated the length of the year,compiled the first known star catalog,and made an early formulation of trigonometry. Calculated the distance between the Earth and the moon. -
100 BCE
Ptolemy
The Ptolemaic model shows “Earth Centered”. Ptolemy thought that all celestial objects including planets,Sun,Moon,stars,orbited around Earth.That it was geocentric. -
1473
Copernicus
The heliocentric model showed that the Sun was the center of the Solar System. Heli means relating to the Sun.Made the scientific method. -
1546
Tycho Brahe
Best known for his accurate and comprehensive astronomical and planetary observations. He made the Tycho system and Rudolphine Tables.Best known for his instruments.Thought that the Sun, planets, and moon rotated around Earth. -
1564
Galileo
Used a telescope to discover four of the moons circling around Jupiter,to study Saturn,to observe the phases of Venus,and to study the sunspots of the Sun.The moons where Callisto,Ganymede,Europa,Io.He solved that stars are not fixed to celestial sphere. -
1570
Hans Lippershey
A German-Dutch. Invented the first Telescope and Refracting Telescope.And invented the compound microscope.3x. -
1571
Johannes Kepler
One of Kepler's law was that planets move in elliptical orbits with the Sun at one focus in oval. -
Refracting Telescope
Uses lenses to collect and focus the light,like binoculars unlike the reflecting telescope. -
Giovanni
French Cassini who discovered the Cassini Division,the dark gap between the rings A and B of Saturn,he also discovered Saturn’s moons. He was also the first person to record observations of the zodiacal light. -
Sir Isaac Newton
Newton developed three laws of motion which form the basic principles of modern physics. His discovery of calculus led to way more powerful methods of solving mathematical problems. Invented the reflecting telescope. -
Reflecting Telescope
The light enters a refracting telescope through the front lens,called the objective lens. -
William Herschel
He discovered Uranus and its moons. He also discovered 2 more of Saturn’s moons.He also determined the temp. of the different colors of the sunlight. -
Percival Lowell
Discovered the planet Pluto and studied the “canalis” on Mars. Built the Lowell observatory in Flagstaff, AZ to study Mars. -
Ejnar
Made a chart classifying types of stars by relating their color to their absolute brightness. -
Albert Einstein
famous for the theory of relativity, which laid the basis for the release of atomic energy and gravity. Invented Einstein refrigerator and the heat pump. -
Edwin Hubble
Using the color of the stars,discovered the universe is expanding. Hubble’s Law,galaxies are moving away from each other. The is the basis of the Big Bang Theory of how the universe began. -
Karl Jansky
discovered radio waves emanating from space. -
Sputnik
Sputnik was the first satillate to be launched by Russia. Space travel became a new priority for the U.S. and education. -
Yuri Gagarin
First human to orbit Earth 108 minutes. He was a Russian. -
John Glenn
1st U.S. Citizen to orbit Earth 3 times. -
Apollo Missions
Designed to land humans on the moon and bring them back. -
Neil Armstrong
First U.S. citizen to walk on the moon. -
First Space Shuttle
The space shuttle was called Space Shuttle Columbia. It launched like a rocket and landed like a plane. -
Mars Pathfinder
It took a year to get to mars with the pathfinders.It is a robotic spacecraft that landed a base station with a roving probe of Mars it was token to Mars on a Delta rocket. -
Cassini Orbiter
It is named after the Italian astronomer Giovanni Cassini.It orbited around Saturn,making an extensive survey of Saturn and its moons. -
SpaceX Falcon Heavy
Most powerful rocket with the ability to lift into orbit nearly 64 metric tons.It is as reliable as Falcon 9.
