Earth Sciences 1086F/G Study Guide - Midterm Guide: Mesozoic, Asthenosphere, Magnesium
24 Oct 2017
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According to this, universe is 11. 5-17. 5 billion years old. In 2007 they found a star 13. 2 billion years old: hubble"s expansion constant: had to propose a constant for the expansion rate. There have been many refinements (based on shape/density matters). However, in any rate expression, there"s a time factor, so it is possible to use hubble"s equation to determine the age of the most distant light source we can find: 2002: hst found some white dwarfs (prime candidate). They must have been 13-14 billion years old (including the 1 billion year it took for the cosmos to cool down after the bb): cmb radiation: most accurate view of conditions in early universe. A model was developed that says the universe is 13. 80 +/- 0. 04 billion years. Light years measures distances in space, it is the distance that light travels in one year: light travels at 300,000 km per second so it is actually 9. 4608 x 1012 km per year.
