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Stellar Evolution
Stellar Evolution

... How does mass affect what happens? How do stars die? Where does gold come from? ...
1 Kepler`s Third Law
1 Kepler`s Third Law

Kepler`s Law - New Mexico Tech
Kepler`s Law - New Mexico Tech

... The Sun’s Lifecycle • The Sun was formed about 4.57 billion years ago when a hydrogen molecular cloud collapsed. • It is about halfway through its main-sequence evolution, during this time, nuclear fusion reactions in its core fuse hydrogen into helium. • It will spend approx. 10 billion years as a ...
Solar System from Web
Solar System from Web

... The Sun’s Lifecycle • The Sun was formed about 4.57 billion years ago when a hydrogen molecular cloud collapsed. • It is about halfway through its main-sequence evolution, during this time, nuclear fusion reactions in its core fuse hydrogen into helium. • It will spend approx. 10 billion years as a ...
dtu7ech10sun - Fort Thomas Independent Schools
dtu7ech10sun - Fort Thomas Independent Schools

... The Sun is powered by thermonuclear fusion, which converts hydrogen into helium. ...
Stellar Evolution Stations
Stellar Evolution Stations

... As the disk got thinner and thinner, particles began to stick together and form clumps. Some clumps got bigger, as particles and small clumps stuck to them, eventually forming planets or moons. ...
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The Inner Planets: A Review Sheet - bca-grade-6

... Jupiter. - They act like a perfect border between the inner (rock-based) planets and the outer (gas-based) planets. - Astronomers think Jupiter's gravitational force on the asteroids keeps them from smashing into the inner planets. The presence of Jupiter actually protects Mercury, Venus, Earth, and ...
Introduction to the HR Diagram
Introduction to the HR Diagram

... Again, an important thing to notice in the above diagram is the tremendous range in luminosities (energy output) that stars can have relative to the Sun. This diagram is therefore an external manifestation of internal characteristics of a star. As a star evolves, its internal properties change and ...
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... than our sun) and they are of spectral type O, B, A, F. So white dwarfs are smaller, more dense, and much dimmer than red giants. They are hotter than red giants and are in different spectral classes (OBAF) as they give off different wavelengths of light (at the blue end of the spectrum compared wit ...
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Nuclear fusion in stars and laboratories
Nuclear fusion in stars and laboratories

... in the US. The beta-unstable nuclei produced are detected using x-rays emitted following K-capture. 2. The very high energy neutrinos (above about 5 MeV) are studied by observing them scattering from electrons in very pure water. Neutrinos entering water are virtually unable to interact with the nu ...
Yeatman-Liddell College Preparatory Middle School Winter
Yeatman-Liddell College Preparatory Middle School Winter

... Our local star is the Sun. It appears to be rather small as stars go. Stars are fueled by hydrogen, and they exist until the last of their hydrogen fuel is used up. Our Sun will not run out of hydrogen for 5 billion years. Then our Sun will swell up and become a red giant. The core will continue to ...
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How the Sun Shines
How the Sun Shines

How the Sun Shines
How the Sun Shines

... The next major step in understanding how stars produce energy from nuclear burning, resulted from applying quantum mechanics to the explanation of nuclear radioactivity. This application was made without any reference to what happens in stars. According to classical physics, two particles with the s ...
arXiv:astro-ph/0009259 v3 12 Dec 2000
arXiv:astro-ph/0009259 v3 12 Dec 2000

How the Sun Shines - School of Natural Sciences
How the Sun Shines - School of Natural Sciences

... The next major step in understanding how stars produce energy from nuclear burning, resulted from applying quantum mechanics to the explanation of nuclear radioactivity. This application was made without any reference to what happens in stars. According to classical physics, two particles with the s ...
Components of the Solar System Chapter 16
Components of the Solar System Chapter 16

... ends. It ends at the point at which objects are no longer affected by the sun’s gravitational pull, solar wind and the sun’s magnetic field. Some believe it ends at the Oort Cloud outside the Kuiper Belt. ...
How the Sun Shines
How the Sun Shines

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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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