The sun’s gravity holds all of the planets and comets in orbit

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Presentation transcript:

The sun’s gravity holds all of the planets and comets in orbit Why is the gravity of the sun so high?

The Sun’s Interior What happens in the center of the sun? Nuclear fusion Hydrogen joins to form Helium http://www.astro.ubc.ca/~scharein/a311/Sim/fusion/Fusion.html

The Sun’s Interior Core temperatures reach up to 15 million degrees Enough hydrogen fuel in the sun to last for a total of 10 billion years. How old is the sun now?

The Sun’s Atmosphere 3 Layers Photosphere Chromosphere Corona

The Photosphere Inner layer of the sun’s atmosphere The sphere that makes “light” This is what you see when you look at the image of the sun. blue.utb.edu/.../solar_system_origins.html

The Chromosphere Seen during an eclipse – beginning and end Middle layer of the sun’s atmosphere Chromo = “colors” Eclipse - www.vt-2004.org/Background/Infol2/EIS-C2.html

The Corona Visible during the middle of a solar eclipse Corona = “crown” Only visible during eclipses and through telescopes from Earth’s surface. www.vt-2004.org/Background/Infol2/EIS-C2.html

The Corona (cont.) Solar winds = a stream of electrically charged particles. Usually blocked by the atmosphere and magnetic field Sometimes reaches North or South Poles and causes auroras

http://www.nasa.gov/vision/universe/solarsystem/sept_aurora.html

Features of the Sun Sunspots- darker areas Prominences Solar Flares Areas of gas on the sun that are cooler than the gases around them. Prominences Reddish loops of gas that link different parts of sunspot regions Solar Flares Explosions that occur when prominences link together. (H2 explodes)

Sunspots Explanation: July was a good month for sunspots ... really big sunspots. In fact, the full disk and inset pictures above show three large groups of spots, photographed only a few days ago on July 28. Together the sunspots span a region about thirty times the diameter of planet Earth. http://apod.gsfc.nasa.gov/apod/ap020801.html

Prominences http://apod.gsfc.nasa.gov/apod/ap051005.html

Solar Flares Solar flare video - http://science.nasa.gov/headlines/y2002/06feb_hessi.htm

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