Yes, this is the case. And Cherenkov radiation is visible, too. My first reaction on seeing the title was "this has existed for years". I think here they're act

Yes, this is the case. And Cherenkov radiation is visible, too. My first reaction on seeing the title was "this has existed for years". I think here they're actually talking about the setup used to image a "mach cone" in cherenkov radiation (the use of dry ice creates a non-vacuum medium in which the radiation may occur)