I'd suggest that the terms are contrived, rather than the concept. "Dark" is used to imply something unknown in this context, but many laymen believe "Dark Matt

I'd suggest that the terms are contrived, rather than the concept. "Dark" is used to imply something unknown in this context, but many laymen believe "Dark Matter" and "Dark Energy" are understood quantities, since they sound as such. A more appropriate term would be "Unknown Matter" etc... but this would be far less cool sounding.