plural of optical black hole

A phenomenon in which slow light is passed through a Bose-Einstein condensate that is itself spinning faster than the local speed of light within to create a vortex capable of trapping the light behind an event horizon, just as a gravitational black hole would.

plural of American black bear

plural of black box warning

plural of black-footed rock wallaby

plural of black-bellied sandgrouse

plural of black swallow-wort

plural of black garden ant

plural of black-headed parrot

plural of black-billed capercaillie