ASTR 0115 Lecture 6: 929AstronomyNotes

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San Francisco State University
ASTR 115
Mc Carthy, Christopher

929 Notes Spectrometers measure colors by determining how much light of each color of light is received. Doppler Effect: Applications The Doppler Effect can be used to measure if something is in motion and how fast it is moving Police: Speeding Tickets Weather : Doppler RAdar Astronomy : Motions of stars including planet detection. Chapter 4 Summary Wiens Law: Measure Temperature Bohr model Atoms And Light How a spectrum is formed Doppler : Effect: Measure motion Chapter 5: The Sun Our Star The Sun: Our Nearest Star The Sun is a star Because it is so close, its very bright We can apply what we learn about the Sun to other stars. The Sun is an ordinary star Some stars are larger, some smaller Some stars are brighter, some dimmer Some stars are older, some younger Suns General Properties It is 109 times larger than Earth 330,000 times Earths mass Consists entirely of gas Surface temperature = 5800 K Central temperature = 15 million K Composition of The Sun The sun is a plasma an extremely hot gas The atoms electrons are ionized stripped away from the nucleus The sun is made mostly of Hydrogen (~70) Helium (~30) To study the sun we consider its interior and its atmosphere The Outer Parts of the Sun The outer layers of the Sun are called the Suns atmosphere. It is usually divided into the 3 layers The photosphere is the layer we see The chromosphere is just above the photosphere
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