Dark matter remains a mystery because there has been no direct observation of it, he explained.
CNN: Space station detector gives first clues to 'dark matter'
This is a transition from speculation about the size of streambed material to direct observation of it.
FORBES: Curiosity Finds Evidence Of Ancient Stream On Mars
Of course, it is thanks to Planck that we now know there is slightly more "stuff" out there than we thought, even if most of it is in a form beyond direct observation.
BBC: Planck telescope: A map of all the 'stuff' in the cosmos
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