Difference between revisions of "Expanding universe"
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| + | [[Image:Redshift.png|thumb|The visible light spectrum of a distant group of galaxies (right), compared to the optical spectrum of the Sun (left). Note that the more distant light sources have shifted towards the red end of the spectrum.]] | ||
It is generally agreed by <s>libru atheist hereti</s> scientists that the observable universe is expanding.<ref>http://archive.ncsa.uiuc.edu/Cyberia/Cosmos/ExpandUni.html</ref> This knowledge is based primarily on the observed [[red shift]] of distant galaxies. Objects with a higher red shift are moving away from us faster (see [[Doppler Effect]]). [[Edwin Hubble]], who first measured the distance to other galaxies, found that almost all galaxies display a red shift and are therefore receding from <s>America</s> the Sun, <ref>http://cosmology.berkeley.edu/Education/IUP/GlossaryF_J.htm</ref> and that galaxies further away display a greater red shift than ones nearby. A few of the nearest galaxies, such as Andromeda, are moving toward us.<ref>http://en.wikipedia.org/wiki/Andromeda-Milky_Way_collision</ref> | It is generally agreed by <s>libru atheist hereti</s> scientists that the observable universe is expanding.<ref>http://archive.ncsa.uiuc.edu/Cyberia/Cosmos/ExpandUni.html</ref> This knowledge is based primarily on the observed [[red shift]] of distant galaxies. Objects with a higher red shift are moving away from us faster (see [[Doppler Effect]]). [[Edwin Hubble]], who first measured the distance to other galaxies, found that almost all galaxies display a red shift and are therefore receding from <s>America</s> the Sun, <ref>http://cosmology.berkeley.edu/Education/IUP/GlossaryF_J.htm</ref> and that galaxies further away display a greater red shift than ones nearby. A few of the nearest galaxies, such as Andromeda, are moving toward us.<ref>http://en.wikipedia.org/wiki/Andromeda-Milky_Way_collision</ref> | ||
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==The Big Bang== | ==The Big Bang== | ||
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==Objections== | ==Objections== | ||
A Google search reveals numerous websites which purport to explain the observed red shift by invoking the interference of intergalactic gases like molecular hydrogen, and which use this to attack the big bang theory.<ref>http://www.newtonphysics.on.ca/hydrogen/index.html</ref> However, Hubble's Law has been observed to hold true with a high degree of accuracy; given that matter likes to [http://rationalwiki.com/wiki/Gravity clump together], it's <s>highly unlikely</s> '''bullshit''' that intergalactic hydrogen is distributed evenly enough to produce these results. An isotropic expansion of space in all directions is by far the simplest explanation for the observations. | A Google search reveals numerous websites which purport to explain the observed red shift by invoking the interference of intergalactic gases like molecular hydrogen, and which use this to attack the big bang theory.<ref>http://www.newtonphysics.on.ca/hydrogen/index.html</ref> However, Hubble's Law has been observed to hold true with a high degree of accuracy; given that matter likes to [http://rationalwiki.com/wiki/Gravity clump together], it's <s>highly unlikely</s> '''bullshit''' that intergalactic hydrogen is distributed evenly enough to produce these results. An isotropic expansion of space in all directions is by far the simplest explanation for the observations. | ||
| − | + | [[Image:Redshift_blueshift.png|thumb|left]] | |
==See also== | ==See also== | ||
*[http://en.wikipedia.org/wiki/Hubble%27s_law Hubble's Law] | *[http://en.wikipedia.org/wiki/Hubble%27s_law Hubble's Law] | ||
Revision as of 02:05, 1 February 2009
It is generally agreed by libru atheist hereti scientists that the observable universe is expanding.[1] This knowledge is based primarily on the observed red shift of distant galaxies. Objects with a higher red shift are moving away from us faster (see Doppler Effect). Edwin Hubble, who first measured the distance to other galaxies, found that almost all galaxies display a red shift and are therefore receding from America the Sun, [2] and that galaxies further away display a greater red shift than ones nearby. A few of the nearest galaxies, such as Andromeda, are moving toward us.[3]
The Big Bang
The expanding universe is one of the pillars of the Big Bang theory. There is an inverse relationship (known as Hubble's Law) between any galaxy's distance and the speed at which it recedes from us. Hubble's law is a linear function, implying that all galaxies (and therefore all visible matter) once occupied the same point.
Objections
A Google search reveals numerous websites which purport to explain the observed red shift by invoking the interference of intergalactic gases like molecular hydrogen, and which use this to attack the big bang theory.[4] However, Hubble's Law has been observed to hold true with a high degree of accuracy; given that matter likes to clump together, it's highly unlikely bullshit that intergalactic hydrogen is distributed evenly enough to produce these results. An isotropic expansion of space in all directions is by far the simplest explanation for the observations.
