Mare Cognitum is Latin for "Sea that has become known." If you're into NASA and outer space stuff, then you may be familiar with this term.
Mare Cognitum, however, is also Jacob Buczarski's one-man black metal project from Santa Ana, California. Atmospheric at times, An Extraconscious Lucidity pummels its way through 6 songs in 49 minutes. I stumbled upon this recently and am surprised that more people aren't talking about this. It's available at bandcamp for the "name your price" option, so you can either get it for free or donate what you can to show your support.