ASTRON 2B03 Lecture Notes - Lecture 27: Red Giant, Horizontal Branch, Stellar Nucleosynthesis
2 Dec 2016
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Document Summary
2 rules of thumb: as stars evolve, they move from main sequence to the giant branch big stars do it faster so length of main sequence tells you the age of the globular cluster. Most of physics can be measured in a lab. 1965 - a new element was found accidently early on, they used microwave antenna (only looking for microwave photons) they found small amounts of uniform microwave radiation everywhere. Princeton predicted that if the universe came from. Big bang, then there should be radiation everywhere in the sky (coming from university as a whole) Universe is expanding (hubble"s law) -> 13 billion years ago. It seems to have beginning time of 13-14 billion years (this is also ages of oldest known stars) It is filled with cool, low-energy microwave radiation. Restatel the cbr is always present around us, but it gets colder and more dilure as the universe expands.
