When a white dwarf is cooled down is it a black dwarf?

the rub-al-khali is also known as the arabian desert and the "empty quarter"

explanation:

on august 6, 1945, just days after the potsdam conference ended, the u.s. bomber enola gay dropped the uranium bomb known as “little boy” on the japanese city of hiroshima. despite its devastating effects, japan didn't offer unconditional surrender right away, as the united states had hoped.