STARS. Star. 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. Hydrogen. Helium. Nuclear Fusion.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Star 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 Hydrogen Helium Nuclear Fusion What is the closest star to Earth? SUN Proxima Centauri is the next closest at 4.2 light years away
What is the sun made of? Hydrogen 73% ___________________ 25%____________________ Helium Is it a big star? No, it is an average (medium) size star
CORONA PHOTOSPHERE CORE RADIATIVE CONVECTIVE CHROMOSPHERE
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. 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 outwards. 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. outwards. http://www.windows.ucar.edu/tour/link=/sun/Solar_interior/Sun_layers/Convection_zone/sun_conv_big_jpg_image.html
Outer Layers of the Sun Photosphere Chromosphere Corona
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
________________ 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. Chromosphere Corona • ________________ is the layer above the chromosphere. • The corona extends for millions of miles • Temperatures are tremendous, reaching one million °C. http://zebu.uoregon.edu/~soper/Sun/chromosphere.html
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. _______________________ 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. Solar Prominence
Solar Wind The top of the corona is constantly flowing into space, where it becomes _________ ____________. Solar wind
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
Spectrum shows absorption lines (absorbs that wavelength of light) • These lines show what elements are in the stars (spectral types). http://www.enchantedlearning.com/subjects/astronomy/