WIMPs (also not yet observed because, as the name suggests, they would practically never interact with ordinary matter).
This is because most cosmologists reckon that the Big Bang could not have generated nearly enough ordinary matter--dark or light--to create a closed universe.
Research is ongoing to figure out precisely what these "dark" components are, because they do not interact with ordinary matter and have never been directly detected.
CNN: Space station detector gives first clues to 'dark matter'
About 25% of the universe is believed to be dark matter, about 70% is the little-understood dark energy, and about 5% is ordinary matter made of atoms.
It appears that ordinary matter -- all of the stuff that we can see, such as planets and stars -- makes up only 4.9% of all the universe.
Dark matter was first detected in the 1930s, thanks to its gravitational effects on ordinary, visible matter.
This is a community of mutual respect, but it is still distinctly divided at all the levels that matter in ordinary life.
One says ordinary lightning sometimes causes matter to separate.
However, the pain that the economy is inflicting on ordinary Americans is no laughing matter.
Super-specialists have two advantages over ordinary specialists: greater knowledge of the details that matter and an ability to handle the complexities of the job.
They may even have heard this tantalizing detail: With five-year averaging, lump sum retirement payouts are taxed at rates as low as 7.5% , no matter how high a taxpayer's ordinary rate.
Whether ordinary Japanese, fearful about their economic future, consider these matters to be a priority is another matter.
ECONOMIST: An unusual militancy is creeping into mainstream politics
And in an effort to promote its own shows, as a matter of company policy Viacom routinely left up clips from shows that had been uploaded to YouTube by ordinary users.
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