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Intro

Objective 03/26/12. Identify the units of a calendar. Intro. How do scientists study space?. Astronomy History. Astronomy History. Astronomy. The study of the universe. Astronomy History. Calendar Year . Based on the observation of objects in our solar system

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Intro

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Presentation Transcript

  1. Objective 03/26/12 Identify the units of a calendar. Intro How do scientists study space?

  2. Astronomy History

  3. Astronomy History • Astronomy • The study of the universe

  4. Astronomy History • Calendar • Year • Based on the observation of objects in our solar system • Time required for Earth to orbit once around the sun • 365.25 days

  5. Astronomy History • Month • Day • Amount of time required for the moon to orbit once around Earth • ~ 28 days • Time required for Earth to spin once on its axis • 24 hours

  6. Astronomy History • Rotation (rotate) • Revolution (revolve or orbit) • Spin on an axis • Go around an object

  7. Astronomy History • Early Astronomers • Could only observe the universe with their eyes and minds • Thought universe had only Sun, Moon, and planets, with stars at the edge of universe

  8. Astronomy History • Ptolemy • 140 C.E. • Greek Astronomer • Geocentric • Earth at center of universe • This theory lasted 1,500 years!

  9. American History • Copernicus • 1543 • Polish Astronomer • Heliocentric • Sun is the center of the universe

  10. Astronomy History • Tycho Brahe • Late-1500s • Danish Astronomer • Invented several large tools to study the universe and took many precise measurements and data • Believed in different geocentric universe

  11. Astronomy History • Johannes Kepler • 1609 • Brahe’s assistant • Used Brahe’s data to prove heliocentric universe AND planets orbit in elliptical orbit • Developed the 3 laws of planetary motion which are still used today

  12. Astronomy History • Galileo Galilei • 1609 • First person to use a telescope to observe object’s in space • Discovered: • Moon has craters and mountains • Four of Jupiter’s moons • Sunspots on the Sun

  13. Astronomy History • Isaac Newton • 1687 • Discovered the law of gravity • All objects in the universe are attracted to each other • Explains the orbits of planets around the Sun

  14. Astronomy History • Edwin Hubble • 1924 • Proved other galaxies existed beyond our galaxy • The universe is much MUCH bigger than previously thought

  15. Astronomy: A history

  16. Objective 03/26/2012 Identify the units of a calendar. Outro How can you study space?

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