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The Sun
The Sun

... • Places where the sun’s magnetic field is concentrated and inhibits the normal convective flow of hot material from below. So the material sits on the surface and cools off as it radiates to the sky. • Charged particles in a magnetic field feel a force sideways to their motion, binding the gas to t ...
Name Period ______ Astronomy Unit Study Guide 1. _____
Name Period ______ Astronomy Unit Study Guide 1. _____

... 16. What is the reason for Earth’s seasons? How long does it take the Earth to orbit the sun once? 17. Define: ...
steady flow
steady flow

STARS and GALAXIES
STARS and GALAXIES

... • A large ball of gas held together by gravity that produces tremendous amounts of heat and light. • Some stars are very old and the size of planets or moons, and some no longer emit radiation (no light). ...
Sun
Sun

... up and rises to the surface. Photosphere – (circle of light) This is the outer visible of the sun. It contains many ...
Stars - Independence High School
Stars - Independence High School

... • Fission- Separation of large nucleus into smaller nuclei • The Sun uses fusion to combine Hydrogen into Helium ...
Properties of stars during hydrogen burning
Properties of stars during hydrogen burning

Objects in the Sky Power Point
Objects in the Sky Power Point

... Halley's Comet orbits the Earth every 76 years. ...
THE SUN - Halton District School Board
THE SUN - Halton District School Board

... own gravity is balanced by the nuclear explosions at its core. ...
The Sun*s
The Sun*s

... each time, until the core temperature cannot rise any higher.  At this point, the star “dies”. ...
Solar System
Solar System

... THE SUN • Photosphere- the brightest part of the sun • Chromosphere- gives off faint red light and cannot be seen • Corona- halo that surrounds the sun ...
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... • Sound waves cross the the solar interior and reflect off of the surface (photosphere). ...
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... •  In addition to the p-p cycle, there is the CNO Cycle, in which the C, N, O, nuclei catalyze the burning of H into He •  The rates of TNR are usually very steep functions of temperature, due to high potential barriers •  Generally, more massive stars achieve higher Tc , and can synthesize elements ...
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Homework Solutions: Chapter 7, The Sun
Homework Solutions: Chapter 7, The Sun

... A: The spectral emission lines of the corona are strongly broadened in wavelength, indicating extremely high temperature. Furthermore in the corona’s spectrum we find emission lines of highly ionized gases which also give us more evidence that corona has a very high temperature. RQ: 7-13 Q: Why does ...
Fusion in the Sun
Fusion in the Sun

The Sun: Home Star
The Sun: Home Star

... • Key to solar-stellar connection • Close-up model for other stars • Local “lab” for testing ideas about the physics of stars • Energy source for most life on earth ...
STARS In your textbook, read about the properties of the Sun and
STARS In your textbook, read about the properties of the Sun and

... 6. Stars on the main sequence produce energy by fusing hydrogen into----' 7. As a contracts, its rotation forces it into a disk shape with a hot condensed object at the center, which will become a new stsr. 8. During a the entire portion of the star is blown off in a massive explosion! What are Gala ...
Notes 14-2
Notes 14-2

... The Sun is a Star • Star made of hydrogen and helium • located at the center of the solar system and is also the largest object • Has a strong gravitational pull which holds planets in orbit • 4.6 billion years old ...
Stars
Stars

... A star is a sphere of hot gas that emits light and radiation ...
Our Sun is a Star:
Our Sun is a Star:

Astronomy II (ASTR1020) — Exam 1 Test No. 1D
Astronomy II (ASTR1020) — Exam 1 Test No. 1D

... 4. Which of the following best describes a photon’s journey inside the Sun? a) Travels in a straight line at the speed of 2.997925 × 105 km/s. b) Travels in a curved path following the Sun’s magnetic field. c) Travels in a zig-zag (random walk) type of path. d) Photons do not exist inside the Sun. e ...
Dark Matter and Its Direct Detection
Dark Matter and Its Direct Detection

A Red Giant - Cloudfront.net
A Red Giant - Cloudfront.net

... Stars with masses similar to our Sun fuse at a rate that allows them to “live” as mainsequence stars for about 10 billion years. Then they run out of Hydrogen in their core Hydrostatic Equilibrium is lost… They Shrink a bit And begin to fuse Hydrogen into Helium in a shell outside the core. ...
We Are All Star Dust - High School of Language and Innovation
We Are All Star Dust - High School of Language and Innovation

... Inside the Sun, Temperatures are so High… • Nuclear Fusion occurs ...
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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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