ASTRON 1101 Lecture Notes - Lecture 39: Virgo Supercluster, Proton Decay, Red Giant
8 Dec 2016
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At t = 0, the big bang occurred (start of expansion) At t = 13. 7 billion years is now. At t = 19. 2 billion years (5. 4 billion years from now), the sun will become a red giant. When the sun exhausts hydrogen in its central core, it will swell into a red giant star: mercury and venus will be engulfed. How do we know this will happen: we see the sun"s older neighbors are already red giants. After being a red giant, the sun will end as a gradually cooling white dwarf. At t = 2 trillion years: isolation of local supercluster. The local group of galaxies is part of a long filamentary structure called the local. Supercluster : the local supercluster is gravitationally bound. Beyond the local supercluster, accelerated expansion will whisk away galaxies until they are too redshifted to see: once galaxies move away faster than light, we receive no additional photons from them.
