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Astronomy

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Transcript

  • 1. Astrology vs. Astronomy Which one is science? astro - star -logy – study of -nomy – arrangement, law
  • 2. Calendars – based on astronomical movements Day – Earth’s rotation (spinning) Month – moon orbits Earth (approx.) Year – Earth revolves around sun
  • 3. Early Astronomers Ptolemy – thought Earth was center of the universe geo centric
  • 4. Copernicus -determined that the Sun is the center of the solar system
  • 5. Tycho Brahe – made very precise observations. Thought moon and sun revolved around Earth, but other planets around the sun.
  • 6. Johannes Kepler Used Brahe data to determine that the planets revolve around the sun in elliptical orbits. The sun is not in the exact center.
  • 7. Galileo Galilei
    • One of the first to use a telescope
    • Discovered
        • Craters and mountains on moon
        • 4 moons of Jupiter
        • Sunspots on the sun
        • Phases of Venus
  • 8. Isaac Newton -described the force of gravity which depends on the mass of the objects and the distance between them -explained observations of other astronomers
  • 9. Edwin Hubble
    • Proved galaxies exist beyond our own
      • Milky Way
  • 10. Optical Telescopes
    • Refracting
      • Set of lenses
      • Not perfect focus
      • Lens can’t be very large
    • Reflecting
      • Uses curved mirror
      • Can focus perfectly
      • Flaws do not affect focus
      • Can be very large
      • Preferred by astronomers
  • 11. Where is the best place to put a telescope?
    • On mountain to avoid light and air pollution
    • Dry areas to avoid moisture problems
    • Space – to avoid all those problems
  • 12. Light Year
    • Unit of distance not time
    • Light travels 946,000,000,000,000 km in a year
    • We can observe objects 10 billion light years away
  • 13. Artificial Satellites Military Weather Communication
  • 14. Space Probes
    • Uncrewed vehicle that carries instruments to planets or other bodies in space
      • Luna 9 (1966) – moon
      • Venera 9 (1975) – Venus
      • Vikings (1975) – Mars
      • Stardust (1999) – comet
  • 15. People in Space
    • 1 st person – Yuri Gagarin
    • 1 st American – Alan Shepherd
    • 1 st person on moon – Neil Armstrong
    • 1 st American woman – Sally Ride
  • 16. Tragedies
    • 1986 Challenger Explosion just after takeoff
    • Columbia Explosion – upon reentry
  • 17.  
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  • 20.