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What is Astronomy?

What is Astronomy?. A Study Of:. Astronomy. What are some reasons for people, as a whole, to study Astronomy? What are some reasons for you, personally, to study Astronomy?. What is Astronomy?. A Search For:. Astronomical Scale.

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What is Astronomy?

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  1. What is Astronomy? • A Study Of:

  2. Astronomy • What are some reasons for people, as a whole, to study Astronomy? • What are some reasons for you, personally, to study Astronomy?

  3. What is Astronomy? • A Search For:

  4. Astronomical Scale The Universe and the things in it are bigger than we can imagine. To help, we use:

  5. Models • --Representations of real objects or events

  6. Certain aspects of a model HAVE to be incorrect

  7. What are some models that are used in Astronomy?

  8. Scientific Notation • Because the universe is so big, it is easier to use scientific notation as an abbreviated way to write down numbers. • This will also make very small numbers with a lot of decimal places much easier.

  9. Scientific Notation • For example: 93,000,000 1. Write down the “non-zero” numbers, and put a decimal point after the first number. 9.3

  10. Scientific Notation • For example: 93,000,000 9.3 7 2 3 4 5 6 1 Then count the number of zero’s or places that follow the new decimal and write them in an exponent like this: x 107

  11. Scientific Notation • For a small number like: 0.00000234 1. Write down the “non-zero” numbers, and put a decimal point after the first number. 2.34

  12. Scientific Notation • For a small number like: 0.00000234 2.34 2 3 4 5 6 1 Then count the number of zero’s or places that follow the new decimal and write them in a negative exponent like this: x 10-6

  13. Write the following in Scientific Notation: • 3,400 • 0.0920 • 401,000 • 0.000000045 • 60,000,000,000 • 150,000,000,000

  14. Convert the following from Scientific Notation: • 7.3 x 105 • 3.001 x 103 • 6.11 x 10-6 • 4.9 x 1010 • 1.7 x 10-4 • 2.4 x 108

  15. Astronomical Unit • The average distance from Earth to the Sun • miles • m • AU’s are used for distances like those

  16. Image Link

  17. Light-year • The distance light travels in one year. **A Distance** • Sp. of light = miles/sec • 1 ly = km • AU • How many miles in one ly?

  18. Light-year • The nearest star, Proxima Centauri, is ___ ly from Earth. • If the sun were a golf ball in NYC, the nearest star would be in _______.

  19. Light-year • The sun is 8 light-minutes from Earth. (93 million miles) • Light years are used for larger distances like those between stars.

  20. Looking at the Stars • Size of the “dots” in the sky only represents the brightness of the stars, • not the size or distance. • Brighter stars make larger dots on photographs • Our sun is a faint star and would probably not show up in Fig. 1-10

  21. Looking at the Stars • Only a century ago, scientists thought the galaxy was the entire universe, of which our sun is in the outer part. • Having billions of galaxies makes it hard to keep a proper sense of scale.

  22. Alpha Centauri Central Bulge of Milky Way

  23. Billions of Galaxies • Billions of Stars • Billions of Planets? • Life only on Earth?!

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