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150
Ptolemy states his geocentric theory of the solar system
Ptolemy states his geocentric theory of the solar system -
500
Aryabhata makes many computations about the earth
He computed the circumference of the earth, the regularity of eclipses of the sun and moon, and and how long the earths revolution around the sun is. -
Jan 1, 1514
Copernicus' states his heliocentric theory of the solar system
Copernicus states his heliocentric theory of the solar system. Most things revolve around the sun -
Kepler states his first two laws
- The shape of any planet's orbit around the sun is elliptical with the sun at one focus
- An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time
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Galileo Galilei discovers Jupiter's moons and Saturns rings, disproving part of Ptolemy's theory of the solar system
Galileo Galilei discovers Jupiter's moons and Saturns rings, disproving part of Ptolemy's theory of the solar system -
Kepler states his third empirical law
The ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their average distances from the sun. -
Christiaan Huygens indentifies the rings of Saturn
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Cassini computes how fast Jupiter, Mars, and Venus rotate
Cassini computes the speed at which Jupiter, Mars, and Venus rotate -
Newton Theorizes about gravity
Gravity keeps planets in their orbits. Without it they would be flung into deep space. Centrifugal force is the other factor that keeps planets in their orbits. Without it they would be drawn into the sun. -
Halley predicts the path of Halley's comet
Halley predicts the path of Halley's comet and figures out its return path in 1757. A comet is a chunk of rock and ice orbiting the sun. When passing close by the sun, a bright tail appears made of ice and rock coming off of the comet. -
Giuseppe Piazzi discovers Ceres: First discovered asteroid
Asteroids are a rocks a few miles across that orbit the sun. Most of them orbit in clusters, between the orbits of Mars and Jupiter. -
Pluto is discovered
It is different from the outer planets because it is terrestrial and hs no rings. The other outer planets have rings and are gaseous and very large. Pluto is more like the inner planets: rocky and small. -
Apollo 8 takes first pictures of the sphere of the earth
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Evidence of an ocean is discovered on Jupiter's moon Europa
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Voyager one sends back first data of heliosheath
A heliosheath is the region where the solar wind is slowed. -
First information gathered from Mars rovers
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First recorded meteor shower
A meteor shower is when meteoroids come in contact with the earth's atmosphere. Meteoroids are small bodies of rock moving through the solar system, -
Ja'far Muhammad ibn Musa ibn Shakir hypothesizes of gravity.
Ja'far Shakir hypothesizes that celestial bodies are subject to the same physics laws as Earth and suggests that there is a force of attraction between celestial bodies.
