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why do I have fireflies in my mayonaise jar and not dark matter?

if dark matter makes up 80% of our universe shouldn't I be filling my mayonnaise jar with it instead of fireflies by now?

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    Aug 8 2012: You do have dark matter in your mayonaise jar. You just can't see it because its dark. Dark means it doesn't give off light. Transparent is a kind of darkness.
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      Aug 8 2012: That's helpful to me!
    • Aug 8 2012: so dark matter is weightless, odorless, colorless, and currently completely undetectable I don't have to declare it when I travel through customs?
  • Aug 9 2012: To the best of my knowledge, "dark matter" is a code word for something physicists know almost nothing about.

    Given how little we know about dark matter, your mayonnaise jar could be chuck full of the stuff and you would have no way of knowing.

    Isn't it interesting that for all these years the particle physics folks have been pretty much mystified by gravity. Now just when they are, maybe, getting the Higgs boson in their sites, along comes the complete mystery of dark matter. Sounds like a good time to start a career in theoretical physics.
    • Aug 10 2012: there are SO many mysteries, and it seems like solving one just creates five more!
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    Aug 8 2012: I switched jars on you. You have the "light" matter and I have the "dark" matter. Bob.
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    Aug 8 2012: Maybe dark matter is just firefly-friendly and bends space-time within the mayonaise jar to create an additional 80% to its original volume? The fireflies know! :o)

    Did you ever hear about Neurtinos? They seem to be also in your jar, and lots of them!
    In terms of true volume, matter is almost nothing.
    • Aug 8 2012: Thank you for the reply, yes I know about neutrinos, I've been collecting them for years.. I also have a jar full of wimps
  • Aug 8 2012: To add to Peter Lindsay's comment: You will have more then just fireflies in that jar if you keep the lid off: Other insects & molds.