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INTRODUCTION TO ASTRONOMY

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  1. INTRODUCTION TO ASTRONOMY • What is Astronomy ? • Astronomy is NOT Astrology • Why do we study Astronomy ?

  2. Astronomy - the scientific study of the Universe beyond Earth Astronomy is a true science. It includes the topics of the history of astronomy, human space exploration, our Sun and Moon, planets, other stars, galaxies, and cosmology (the origin, structure, and fate of the whole Universe).

  3. Astronomy is a True Science • Astronomy is based on observations and experiments that can be repeated, and that give the same results no matter who does the experiment or makes the observation. • Astronomy makes precise predictions about our Universe that can be tested to see if the predictions are true or not. • Astronomy makes use of other well-established sciences like physics and chemistry.

  4. Astrology is NOT a Science • Seeks to discover “hidden knowledge” by the interpretation of omens (like reading tea leaves). • Results are not repeatable. • Predictions are vague and not testable. • Does not incorporate sciences like chemistry and physics.

  5. Why do we study Astronomy ? • Natural disasters • Recreation and esthetics • Scientific inquiry and curiosity • Education of an informed society (you !) • Our place in the Universe • Origin and fate of the Universe (Cosmology) • True Science versus science fiction

  6. Natural Disasters • Comet and meteorite impacts, for example.

  7. BOOM !!

  8. Recreation and Esthetics • The Universe is beautiful.

  9. Scientific Inquiry and Curiosity • For example – our instruments can see what our eyes cannot. • Space exploration.

  10. Saturn – Different Kinds of Light

  11. Saturn – Different Kinds of Light Ultraviolet Visible Infrared Radio

  12. Space Exploration

  13. Education of an Informed Society

  14. Our Place in the Universe • Where are we?

  15. 12 ½ light years away

  16. 250 light years away

  17. 5 thousand light years away

  18. 50 thousand light years away

  19. 500 thousand light years away

  20. 5 million light years away

  21. 100 million light years away

  22. 1 billion light years away

  23. 14 billion light years away

  24. Origin and Fate of the Universe • This part of Astronomy is called Cosmology. • Cosmology seeks a scientific explanation for how the Universe began and how it might end (or will it go on forever?).

  25. The Beginning – The Big Bang

  26. 100 billion years from now the Universe will appear frozen in time as we look out into space. Only the light from the Local Group of galaxies will remain visible, if anyone is still around to see it.

  27. True Science versusScience Fiction • Some astronomy stuff may be weird, BUT IT’S TRUE/Present. • Black Holes. • Radiation from the beginning of the Universe. • Science fiction is just weird. • Favorite movies.

  28. A Spinning Black Hole

  29. Radiation from the Beginning of the Universe 13.7 billion years ago