15 Important Discoveries In Astronomy

Timeline created by Ninjajaco
  • 1543

    The First Book Published on the Heliocentric System

    The First Book Published on the Heliocentric System
    An astronomer by the name of Nicolaus Copernicus published a book containing the first theories on a heliocentric system
  • Refracting Telescope is invented

    Refracting Telescope is invented
    Hans Lippershey makes the refracting telescope
  • Proving the Heliocentric System to be True

    Proving the Heliocentric System to be True
    Galileo Galilei discovers craters on the moon,4 satellites of Jupiter,and spots on the sun thus debunking the myth that was the geocentric system
  • Isaac Newton establishes the theory of gravity and the laws of motion

    Isaac Newton establishes the theory of gravity and the laws of motion
    Isaac Newton publishes his first copy of the book Philosophiae Naturalis Principia Mathematica,explaining Kepler's laws of planetary motion
  • The Discovery of Planet Uranus

    The Discovery of Planet Uranus
    An amateur at the time,William Herschel discovers Uranus mistaking it for a comet at first
  • Neptune is Discovered

    Neptune is Discovered
    Johann Gottfried Galle while searching in in a position given to him by Urbain Le Verrier and finds Neptune
  • Rockets are found to work in vacuums

    Rockets are found to work in vacuums
    Konstantin Tsiolkovsky publish articles saying that the rocket will work in the vacuums of space,giving hope for possibility of space flight
  • Picture of Edwin Hubble

    Picture of Edwin Hubble
  • Period: to

    The Discovery of an Expanding Universe

    Edwin Hubble was the first to discover other galaxies and track their movement
  • First Rocket to Break the Sound Barrier

    First Rocket to Break the Sound Barrier
    Robert Goddard's rocket which is the the first to use liquid fuel,is demonstrated and is shown to work in a vacuum,and breaks the sound barrier
  • The First Artificial Satellite Launched by the US

    The First Artificial Satellite Launched by the US
    The US launches Explorer 1 into space
  • Beginning of NASA

    Beginning of NASA
    NASA is created to catch up with Soviet space technologies and absorbs the NACA which was founded in 1915
  • First Human Spaceflight mission to travel past Earth's Gravity,and orbit another celestial object

    First Human Spaceflight mission to travel past Earth's Gravity,and orbit another celestial object
    Apollo 8 manages to make it past Earth's gravitational pull,orbit the moon,and make it back safely
  • New Planet Standards

    New Planet Standards
    IAU changed the definition of a planet,making another class called dwarf planets were also made.Pluto,Ceres,and Eris were changed to dwarf planets.
  • The Discovery of Ninth Planet

    The Discovery of Ninth Planet
  • Juno reaches Jupiter

    Juno reaches Jupiter
    Juno the satellite was launched in 2011 and reaches Saturn in 5 years