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Thursday, March 29, 2012

DARK MATTER


Psalm 138:12

Douay-Rheims 1899 American Edition (DRA)
12But darkness shall not be dark to thee, and night shall be light as day: the darkness thereof, and the light thereof are alike to thee.Job 38:9

 Job 38:9
When I made the cloud the garment thereof, and thick darkness a swaddlingband for it,

Psalms 18:11 "He made darkness his secret place;

What Is Dark Matter?

Abell 2744: Pandora's Cluster Revealed
Abell 2744: Pandora's Cluster Revealed
One of the most complicated and dramatic collisions between galaxy clusters ever seen is captured in this new composite image of Abell 2744. The blue shows a map of the total mass concentration (mostly dark matter).By fitting a theoretical model of the composition of the Universe to the combined set of cosmological observations, scientists have come up with the composition that we described above, ~70% dark energy, ~25% dark matter, ~5% normal matter. What is dark matter? 

We are much more certain what dark matter is not than we are what it is. First, it is dark, meaning that it is not in the form of stars and planets that we see. Observations show that there is far too little visible matter in the Universe to make up the 25% required by the observations. Second, it is not in the form of dark clouds of normal matter, matter made up of particles called baryons. We know this because we would be able to detect baryonic clouds by their absorption of radiation passing through them. Third, dark matter is not antimatter, because we do not see the unique gamma rays that are produced when antimatter annihilates with matter. Finally, we can rule out large galaxy-sized black holes on the basis of how many gravitational lenses we see. High concentrations of matter bend light passing near them from objects further away, but we do not see enough lensing events to suggest that such objects to make up the required 25% dark matter contribution.

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