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astrophysics - Coggle Diagram
astrophysics
evolution of stars
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hydrogen nuclei fuse together to form helium nuclei, releasing energy causing outwards pressure
the outward pressure balances with the inwards pressure due to gravity and the star is now stable (main sequence)
eventually there is no more hydrogen so it collapses due to the unbalance from inwards and outwards pressure, becoming unstable
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if the star has a mass greater than the sun, it expands and becomes a red supergiant
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if it is exceptionally massive, it becomes a black hole
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brightness of a star
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at a standard distance, it can be represented using apparent or absolute magnitude
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doppler effect
if there is a wave source moving relative to an observer, there will be a change in the observed frequency and wavelength.
doppler shift is responsible for the red-shift of light from galaxies which are moving away from Earth, which is when the wavelength of the light coming from them increases. The faster it is moving, the more its light is red-shifted
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