Meet the league of extraordinary supernovae

 作者:沙套     |      日期:2019-03-07 05:04:07
By Maggie McKee SOME of the brightest and strangest objects to grace the skies in recent years are members of a new class of supernovae. Just how they are formed remains a mystery, but their brilliance should make it easier to observe their dim host galaxies. Supernovae come in different varieties. Type Ia blasts, for example, show no hydrogen in their spectra, and occur when the ember of a dead sun sucks in too much material from a companion. Type II explosions, which do have hydrogen,