'Once-in-a-lifetime' nova explosion will appear to add new star to night sky in dazzling spectacle: NASA New York Post "Once-in-a-lifetime" cosmic explosion is likely this summer, NASA says. Here's what to know. CBS News'Once-in-a-lifetime' nova explosion set to stun viewers with spectacular light show, NASA says: All you need to know Hindustan TimesOnce-in-a-lifetime nova explosion to light up the summer sky ZME Science‘Once-in-a-lifetime’ explosion expected to happen over summer, NASA says WFTV Orlando