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THE SUN: OUR STAR
THE SUN: OUR STAR

... hydrogen in the core has been used up. This is where the Sun is in its lifetime right now. Point C is reached when there is no more hydrogen in the core and the fusion of hydrogen starts in the shell around the core. The radius of the Sun will swell to 40% larger than its present size and twice its ...
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Supernovae Type II

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... think about it when it is a beautiful bright sunny day the sun is what is making it such a nice day. I also know that the sun is a star really the sun is a beautiful star in space. ...
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...  But how is the mass turned into energy?  This is done at the center, or core, of the sun, and is achieved through the process known as nuclear fusion.  A nuclear fusion reaction occurs when two nuclei (hydrogen nuclei in the case of our sun) fuse together creating a new nucleus (helium), this re ...
Chapter 12 (Sun)
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... 16. One recent development in astrophysics seems to confuse our understanding of the process of mass conversion to energy in the core of our Sun. What is it? A. The Sun's surface temperature is decreasing too rapidly. B. The gamma-rays from the Sun are the wrong wavelength. C. The Sun's spectrum sho ...
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... 5. The phases of the life cycle that our sun is currently in. 6. The phase our sun will become after it ejects its atmosphere and only its core remains. 8. The point when the Earth is furthest away from the sun.. 9. The lower atmosphere of the sun. 12. The layer of the sun where heat simply radiates ...
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... The problem with this idea was that: 3. In the 1920’s, scientists discovered that the Sun is powered by ___________________________. This occurs under what conditions: ...
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... second (or 1,079,252,848.8 km/h). Converted to imperial  units , the speed of light is approximately 186,282.397  miles  per second, or 670,616,629.384 miles per hour ...
The Sun and Space Objects
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... A meteoroid is debris located outside of Earth’s atmosphere that orbits the sun. •A meteor is debris located within Earth’s atmosphere that vaporizes…known as a shooting star. •A meteorite is a meteoroid that survives its passage through Earth’s atmosphere and hits Earth’s surface. ...
Pathways to Habitability: from disks to active stars, planets and life
Pathways to Habitability: from disks to active stars, planets and life

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Standard solar model

The standard solar model (SSM) is a mathematical treatment of the Sun as a spherical ball of gas (in varying states of ionisation, with the hydrogen in the deep interior being a completely ionised plasma). This model, technically the spherically symmetric quasi-static model of a star, has stellar structure described by several differential equations derived from basic physical principles. The model is constrained by boundary conditions, namely the luminosity, radius, age and composition of the Sun, which are well determined. The age of the Sun cannot be measured directly; one way to estimate it is from the age of the oldest meteorites, and models of the evolution of the Solar System. The composition in the photosphere of the modern-day Sun, by mass, is 74.9% hydrogen and 23.8% helium. All heavier elements, called metals in astronomy, account for less than 2 percent of the mass. The SSM is used to test the validity of stellar evolution theory. In fact, the only way to determine the two free parameters of the stellar evolution model, the helium abundance and the mixing length parameter (used to model convection in the Sun), are to adjust the SSM to ""fit"" the observed Sun.
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