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Stars

Stars. Chapter 4 Astronomy pg.102. Ancient Greeks and other early cultures observed patterns of stars in the sky called Constellations. You have seen and heard of these all your life: Big Dipper, Little Dipper, Cassiopeia ect.

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Stars

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  1. Stars Chapter 4 Astronomy pg.102

  2. Ancient Greeks and other early cultures observed patterns of stars in the sky called Constellations. You have seen and heard of these all your life: Big Dipper, Little Dipper, Cassiopeia ect. Modern astronomy divides the sky into 88 constellations, most named in earlier times. Constellations

  3. If you look in your book on page 105 you will see Polaris and other constellations. Polaris is often called the North Star. Notice how the 2 front stars of the Big Dipper almost point directly to Polaris. Oooo, Ahh! Circumpolar Constellations: As the Earth rotates, Ursa Major, Ursa Minor, and the other constellations in the Northern Sky circle around Polaris. (They appear to move because the Earth is in motion) Look in your book at Cassiopeia, it is an easy one to find because it will be a M or W depending on the season. Polaris

  4. Star Brightness Brightness can be measured in 2 ways. Absolute Magnitude: measured by the amount of light it off. Apparent magnitude: measued by the amount of light received on Earth. If 2 stars are different differences the closer may look brighter, if the same 2 are the same distance away the other may actually be the brightest. Luxes are the unit to measure light intensity. Stop and read p. 106 applying science!

  5. Measurement in Space Light-year –how we measure distance between stars and galaxies! Light-years are the distances that light travels in one year. Light travels at 300,000 km/s or 9.5 trillion km in one year! The nearest star to earth is Proxima Centauri it is 4.3 light years away. Parallax: used to calculate relatively close stars with the angle and change.

  6. Color indicates temperature Hot stars are a blue-white color Cool stars are orange or red. Stars with the same temperature as our sun are yellow. Properties Hey, remember the spectroscope? Astronomers use the spectroscope to see a stars element makeup too.

  7. The Sun’s Layers Stars Sun’s inner layers are the core, radiation zone, and convection zone. Chapter 4 Astronomy.102 The sun’s atmosphere includes the photosphere, chromosphere, and corona.

  8. Because scientist could not observe individual sun spot movement, they concluded the sun rotates. (But it is not like Earth, it is a liquid not solid rotation, It is faster at it’s equator than at it’s poles.) Sun Spots Areas of the Sun that appear darker than surrounding areas are called Sun Spots. These spots are darker because they are cooler than surrounding areas. Check out your book page 110-111 for Prominences and Solar Flares

  9. Your UP! You need to learn about the star cycle! Use section 3 in your book on p. 114-119 to learn about how much longer the Sun will last and the Star cycle. Don’t forget to find out all about the BLACK HOLES! All information will go in your lap book!

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