Dark matter was first detected in the 1930s, thanks to its gravitational effects on ordinary, visible matter.
ECONOMIST: Research from the beginning of time
At least, in theory -- so far, no dark matter has been detected that way.
CNN: How particle smasher and telescopes relate
But other researchers have questioned attributing these seasonal variations that have been detected to dark matter.
BBC: Dark Matter: Experiment to shed light on dark particles
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'
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