a ________________ is a huge mass made of very hot gases (____________________ and...
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A ________________ is a huge mass made of very hot gases (____________________ and ____________________) which produces energy through ________ ___________ process, and then emits such energy in the form of radiation
StarHydrogen Helium
Nuclear Fusion
What is the closest star to Earth?
SUNProxima Centauri is the next closest at 4.2 light years away
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What is the sun made of?
73% ___________________
25%____________________
Hydrogen
Helium
Is it a big star?
No, it is an average (medium) size star
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CORE
RADIATIVE
CONVECTIVE
PHOTOSPHERE
CHROMOSPHERE
CORONA
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http://www.windows.ucar.edu/tour/link=/sun/Solar_interior/Sun_layers/Convection_zone/sun_conv_big_jpg_image.html
The Sun’s Interior
Core:__________ has a tremendously high temperature and pressure. The temperature is roughly 15 million °C. Here is where nuclear fusion occurs, turning four hydrogen nuclei into a single helium nucleus plus a LOT of energy.
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http://www.windows.ucar.edu/tour/link=/sun/Solar_interior/Sun_layers/Convection_zone/sun_conv_big_jpg_image.html
The Sun’s Interior
Radiative Zone:_____________________emits radiation. that spreads outwards. The temperature ranges from 15 million °C to one million °C. It may take photons of radiation millions of years to pass through the radiative zone, as they gradually make their way out
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http://www.windows.ucar.edu/tour/link=/sun/Solar_interior/Sun_layers/Convection_zone/sun_conv_big_jpg_image.html
The Sun’s Interior
Convective Zone:____________________ the photons continue to travel outwards via convection (towards lower temperature and pressure). The temperature ranges from one million °C to 6,000 °C.
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Outer Layers of the Sun Photosphere
Chromosphere
Corona
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Photosphere________________: Surface of the sun (lower atmosphere)
• Consists of a layer of glowing gas (300 miles thick) which radiates most of the _____________ we see.
• The temperature is about 5,500 °C
• It has a thick grainy texture consisting of numerous, relatively small, bright markings called ____________.
light
granules
____________ are cool, dark spots on the surface. They are much bigger than the Earth. They occur in a 11-year cycles.
Sunspots
http://www.enchantedlearning.com/subjects/astronomy/sun/sunspots.shtml
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http://zebu.uoregon.edu/~soper/Sun/chromosphere.html
________________ is the layer above the photosphere.
•It is a very thin layer that appears reddish in color
• Temperatures ranging from 6,000 °C (at lower altitudes) to 50,000 °C (at higher altitudes).
•This layer is a few thousand miles thick.
________________ is the layer above the chromosphere.
•The corona extends for millions of miles
•Temperatures are tremendous, reaching one million °C.
Chromosphere
Corona
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Solar flare_______________ is a magnetic storm which includes a sudden, rapid, and intense variation in brightness. Radiation is emitted across almost the entire electromagnetic spectrum.
Solar Prominence_______________________ is an arc of gas that erupts from the surface of the Sun. They form magnetic loops that hold relatively cool, dense gas suspended above the surface of the Sun.
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Solar Wind
The top of the corona is constantly flowing into space, where it becomes _________ ____________.Solar wind
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How do we know what elements are in the sun and other stars?
By using spectroscopy
Spectroscopy______________: the study of the spectrum of luminous beams and began back in the 19th century.
• Separates various components of beams of light, different wavelength
• Figures out the chemical composition of stars
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http://www.enchantedlearning.com/subjects/astronomy/
• Spectrum shows absorption lines (absorbs that wavelength of light)
• These lines show what elements are in the stars (spectral types).