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 Classic Rock Hits Now That's What I Call Classic Rock Hits Now That's What I Call Classic Rock Hits is one of many genre-themed compilation albums from the "Now!" series in the United States, this one focusing on popular classic rock songs from the 1970s. It was released on May 1, 2012. In his review for Allmusic, Gregory Heaney says "the Now series delivers a dose of good ol' classic rock with "Now That's What I Call Classic Rock Hits"," which "gathers some of rock's most enduring crossover hits." "Now That's What I Call Classic Rock Hits" is "an album that achieves its