Carbonado compared to carbon‑12, relative to typical diamonds). Carbonado exhibits strong luminescence (photoluminescence and cathodoluminescence) induced by nitrogen and by vacancies existing in the crystal lattice. Luminescence halos are present around radioactive inclusions, and it is suggested that the radiation damage occurred after formation of the carbonados, an observation perhaps pertinent to the radiation hypothesis listed below. The origin of carbonado is controversial. Some proposed hypotheses are as follows: None of these hypotheses for carbonado formation had come into wide acceptance in the scientific literature by 2008. Supporters of an extraterrestrial origin of carbonados propose that their material source was a
Now That's What I Call Rock of "Now" features contemporary pop acts with rock roots and takes a "big-tent" approach to the genre. Cliff Chenfeld, co-owner of the Razor & Tie and a consultant for "Now That’s What I Call Rock", feels "most music listeners are pretty open" and this release "is a means of introducing some of those bands to that broader audience who I think would embrace it." The compilers of the set wanted to avoid defining what rock music is in 2016, but instead tried to give what people think it is, "as opposed to using a term for rock that might have