For the first time ever, scientists have captured the full
process of a nova explosion — the moments before, during and after the
Nova explosions are different from supernovas because the star isn’t completely destroyed. Novas happen in two-star systems, when a white dwarf star has been sucking in mostly hydrogen gas from a close neighboring star. The extra hydrogen explodes, but the explosion only happens on the star’s surface. Apparently, white dwarfs have something in common with bears.