Type 1a Supernovae and the Cosmological Constant
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Scan day: 09 February 2014 UTC
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Description: Brief look at recent type Ia supernova data and the cosmological constant
Stars explode as supernovae in basically two ways: When a supermassive star runs out of nuclear fuel in its core, it collapses, rebounds and explodes. The result is a type II supernova. Many stars appear in binary systems. If a white dwarf (a compact dense star) draws in material from its companion, the extra weight can cause the star to collapse. The nuclear chemistry of the star is upset and it explodes. This is a type I supernova. A type Ia supernova is distinguished from other type I supernovae by certain features in its spectrum.
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| Page title: | An Accelerating Universe |
| Keywords: | type Ia supernova,type I supernovae,type II supernova,cosmological constant,cosmological constant problem,white dwarf,expansion rate of the Universe,accelerating Universe,Friedmann,Robertson,Walker,cosmology, fine-tuning problem |
| Description: | Data from type Ia supernovae indicate a non-zero cosmological constant. |
| IP-address: | 98.136.187.13 |
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| WHOIS | Status: ok |
| Date | Creation Date: 2001-09-27T19:28:30Z Expiry Date: 2014-09-27T19:28:30Z |