00:4510 Apr, 2012

When a massive star explodes it is called it a supernova. This explosion is so bright that it will briefly outshine the rest of its galaxy. According to physical equations the supernova remnants should keep expanding for hundreds of thousands of years. If our own galaxy really is billions of years old we should be able to observe more than 5000 supernova remnants with a diameter of 300 light years or more. Yet we don't see a single one! This is exactly what we would expect if our galaxy was 6 -- 10,000 years old. Find more at

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