Hubble Revisits 40-Year-Old Mystery of Strange Star’s Nova
This artist’s concept shows the nova system HM Sagittae (HM Sge), where a white dwarf star is pulling material from its red giant companion. This forms a hot, blazing disk around the dwarf, which can unpredictably undergo a spontaneous thermonuclear explosion as the hydrogen inflow from the red giant thickens and reaches a tipping point. … Read more