The Solar System

By kaia15
  • WORK CITED

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  • Kepler published first two Planetary Motion Laws

    Kepler published first two Planetary Motion Laws
    In 1609 Kepler published his first two laws on Planetary Motion. The first law was "all planets move in elliptical orbits with the Sun at one focus and the other focus empty." The second law was "the line joining the planet to the Sun sweeps over equal areas in equal time interbals."
  • Kepler published the third Planetary Motion Law

    Kepler published the third Planetary Motion Law
    In 1619 Kepler published the third and final Planetary Motion Law. The law was "for any planet, the square of its period of revolution is directly proportional to the cube of its mean distance from the sun."
  • Gravity and Inertia were discovered

    Gravity and Inertia were discovered
    In 1985 Newton discovered gravity. He saw an apple fall from a tree and the thought came to him. Gravity is one out of two things that keeps planets in their place. Galileo discovered inertia, but Newton was the one who found out that they went together.
  • Mercury, Venus, Mars

    Mercury, Venus, Mars
    Mercury, Venus, and Mars were all discovered in anciant times so there is no way to know exactly when they were discovered and by whom. All three of these planets are inner planets. Characteristics of these three planets are, they have a higher density than outer planets, smaller than outer planets , contains mainly rock and metal, has a solid surface.
  • Jupiter and Saturn

    Jupiter and Saturn
    Jupiter and Saturn were also discovered in anciant times. They are both outer planets. Charatereistics of these two planets are, they are large gas giants, they are much bigger than inner planets, mostly made of hydrogen and helium, each has its own system of moons.
  • Uranus

    Uranus
    Uranus was discovered on March 13, 1781 by William Herschel. Uranus is an outer planet. Characteristics of this planet are, it is a large gas giants, they are much bigger than inner planets, mostly made of hydrogen and helium, each has its own system of moons.
  • Comets

    Comets
    A comet is a "dirty snowball" around the size of an Earth mountain. Usually very long and narrow ellipses. Produce tails of gas and dust when they approach the Sun.
  • Meteoriods

    Meteoriods
    A meteor is a chunk of rock, metal, or dust in space.
  • Asteriods

    Asteriods
    The first asteroid was spotted in 1801 by Giuseppe Piazzi. Asteriods are small, rocky worlds. Most asteriods revolve around the Sun between Mars and Jupiter.
  • Neptune

    Neptune
    Neptune was dicovered in 1846 by James Challis and Johann Galle. Neptune's characteristics are, it is a large gas giants, they are much bigger than inner planets, mostly made of hydrogen and helium, each has its own system of moons.
  • Pluto

    Pluto
    Pluto was discovered in 1930 by accident. Pluto was classified as a dwarf planet because it is much smaller than all the other planets. Soon after Pluto was discovered, it was quickly determind that it wasn't an official planet due to its size.