A short history of Dark Energy


	A short history of Dark Energy
crabsallover
3-11-2007 4:37 PM
366 views
tags:
cosmology, dark energy
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/e685fdd7-ff25-4123-a8a0-b5b02f4af3ba/3A7DFF15-576B-4862-B463-78EC55D08850/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html" href="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html" style="font-size: 11px;">christophergovanstreet.blogspot.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">Edwin Hubble discovered in 1929 that the universe seems to be expanding</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html"><SPAN> The tool the team would be using was a specific type of exploding star, or </SPAN><SPAN>supernova</SPAN><SPAN>, that <SPAN>reaches a roughly uniform brightness and so can serve as what astronomers call a standard candle</SPAN></SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">The rate of the expansion of the universe was not slowing down. Instead, it seemed to be speeding up.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">Michael Turner</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">called this <SPAN>antigravitational force "</SPAN><SPAN><SPAN>dark energy</SPAN></SPAN><SPAN>."</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">Dark energy</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">does it change over time and space?</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html"><SPAN>quintessence</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">Does it not change? In that case, they'll call it the <SPAN>cosmological constant</SPAN>, a version of the mathematical fudge factor that Einstein originally inserted into the equations for relativity</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">universe that is 22 percent dark matter, 74 percent dark energy and 4 percent the stuff of us</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">Take the observations of supernovae, apply the other cornerstone of 20th-century physics, quantum theory, and you get gibberish — <SPAN>you get an answer 120 orders of magnitude larger than .74</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">many universes?</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/history-of-discovery-of-dark-matter.html">10 raised to the power of 500</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/3A7DFF15-576B-4862-B463-78EC55D08850/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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