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Stars: Our Sun, nuclear fusion, constellations

Our Sun

Sun animation

The birth of a star: Formed from a nebula

http://jwst.nasa.gov/birth.html

http://en.wikipedia.org/wiki/Formation_and_evolution_of_the_Solar_System

http://en.wikipedia.org/wiki/Nebular_hypothesis

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Nuclear fusion powers stars

fusion-sun

 

Solar nucleosynthesis

 

issue3_fusion1_large

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Structure of our sun

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Life cycle of a star

nebula -> red giant -> collapse -> nova -> white dwarf -> dead star

nebula -> supergiant -> collapse -> supernova -> neutron star

nebula -> supergiant -> collapse -> supernova -> black hole

Simple:

With beautiul photos:

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Hubble Space telescope

http://en.wikipedia.org/wiki/Hubble_Space_Telescope

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Constellations

The night sky tonight
http://www.astroviewer.com/index.php

The night sky tonight (another source)
http://www.telescope.com/content.jsp?pageName=The-Night-Sky-Tonight

List of constellations
http://www2.potsdam.edu/islamma/phys335constellations.htm

Are constellations really groups of stars? (i.e. Stars actually near each other)

Or are constellations really illusions? (i.e. Stars actually are far apart, and only appear to be near each other, when seen from Earth.)

Constellations are an illusion
http://www.ucolick.org/~bolte/AY4_00/week4/star_propertiesC.html

constellation new jpg

From Earth, stars in a constellation appear to be close to each other.
We tend to think that the stars are all at the same distance from us.
But it’s an illusion! In most cases, the stars of a constellation are located at different distances.
Let’s look at Orion the Hunter. Can you tell which star is the farthest? Which is the closest?
Red-colored Betelgeuse (upper left shoulder) and blue-colored Rigel (lower right leg) are the two brightest stars of Orion.
Yet just because a star is the brightest, doesn’t mean it’s the closest. You can’t tell its distance based on its appearance.
The farthest star in Orion is Alnilam, the middle belt star, at 1,359 LY (light-years, the distance light travels in a year.)
There’s 6 trillion miles in one light-year.
The closest is Bellatrix, the upper right shoulder star, at a distance of 243 LY.

constellation
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