The most recent supernova visible to the eye was Supernova 1987A, in the year 1987. I'm hoping to get out into the desert next weekend and hoping it's still visible. It was approximately 168,000 light-years away. How long a supernova takes depends on what exactly you mean. A supernova in our home galaxy might be visible from Earth within the next 50 years. Depending upon the type and energy of the supernova, it could be as far as 3000 light-years away. Source(s): Kind of obvious, come to think of it. … See how to spot the nova with the naked eye. The number of lightyears the star is from us is the number of years it will take for the light to reach here. To see a supernova basically depends on the distance of the exploding star from earth. The explosion of a supernova occurs in a star in a very short timespan of about 100 seconds. These three panels reveal a supernova before, during and after it happened 920 million light-years from Earth(from left to right). The impressive new star explosion, Nova Delphinus 2013, has brightened considerably since its discovery on Aug. 14. On average, a supernova explosion occurs within 10 parsecs (33 light-years) of the Earth every 240 million years. Effects on Earth. The supernova, dubbed iPTF14gqr, is … According to Gonzalez, "Only four giant stars are found at the same distance as the remnant of the supernova of 1006, some 7,000 light years from Earth… A near-Earth supernova is a supernova close enough to the Earth to have noticeable effects on its biosphere. If a supernova were close and bright enough to be seen during the day on earth, how long before it would be invisible in the day time? ... the heat signature from a Milky Way supernova could be visible from Earth as long as we locate it … That is not an easy question to answer. If you are referring to the length of time the debris expands and glows visibly then you're talking weeks. 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