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What has a density of 2.65?

How does the observed density of matter (both luminous in stars and galaxies, and "dark") in the Universe?

  • compare with the critical density? A) The density of luminous and dark matter is currently slightly bigger than the critical density. B) Amazingly, the density of luminous matter (in stars and galaxies) and dark matter currently exactly equals the critical density. C) The density of luminous and dark matter is currently vastly bigger than the critical density. D) The density of luminous and dark matter is currently slightly smaller than the critical density. E) The density of luminous and dark matter is currently far smaller than the critical density.

  • Answer:

    All depends on what you mean by 'critical density' of course. In the sense in which we meant it before the 1990s, at least, the discovery of 'dark energy' means that there is no such thing as 'critical density'.

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If you mean that critical density is the overall density of the universe then the answer is b. If you mean critical density as is the density that was present at the time of the big bang the answer is e.

Brandon

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