I apologize in advance if this is the wrong forum for this thread... My overall question is: What specifics, if any, do we know about the "dark" stuff - ie dark energy and dark matter? Specifically: Do we know anything about what the darkstuffs are made of (either experimentally or through well-reasoned theories)?? Are the terms "energy" and "matter" related in any way to the energy and matter that we experience - or are they simply arbitrary descriptors? How do we know that dark energy and dark matter are two separate entities - and furthermore, is their "darkness" necessarily the same: as in dark energy and dark matter occupy the same dark dimension? Does either darkstuff have any relation to black holes, which I presume are dark in their own way?? Thanks in advance!! PS - Props to those in charge: I really dig these forums!