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- Path: sparky!uunet!dziuxsolim.rutgers.edu!ruhets.rutgers.edu!bweiner
- From: bweiner@ruhets.rutgers.edu (Benjamin Weiner)
- Newsgroups: sci.physics
- Subject: Re: How old is the universe?
- Message-ID: <Sep.14.17.21.17.1992.29178@ruhets.rutgers.edu>
- Date: 14 Sep 92 21:21:18 GMT
- References: <92255.094948DOCTORJ@SLACVM.SLAC.STANFORD.EDU>
- Organization: Rutgers Univ., New Brunswick, N.J.
- Lines: 17
-
- DOCTORJ@SLACVM.SLAC.STANFORD.EDU (Jon J Thaler) writes:
- >The answer to the second question is not known for a simpler reason -
- >we don't
- >know if there is enough matter in the universe to cause it ever to crunch
- >back together. This is the famous "dark matter" problem.
-
- Well, just one part of the famous dark matter problem. Anyway, I
- don't think any of the cosmologists or astronomers who work on this
- think \Omega can be greater than 1. That is, minimal hypothesizing
- gives not enough baryonic matter to "close the universe," there might
- be other dark matter; many people want just enough, i.e. \Omega = 1,
- so that we can have inflation, but that's already stretching. And if
- \Omega = 1, the universe expands asymptotically, i.e. the turnaround
- time is at infinity.
-
- The universe will expand forever, you heard it here first (not in the
- Physical Review newspaper).
-