| 31. | Isotope studies indicate a nearby supernova explosion added fresh material to what became the Solar System.
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| 32. | They were also able, on 23 February 1987, to detect neutrinos from a distant supernova explosion.
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| 33. | The rate of supernova explosion is not great enough to explain the 100 million year extinctions,
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| 34. | In both the primary and secondary star, their cores will eventually collapse, resulting in a supernova explosion.
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| 35. | And neither type of burning, by itself, can easily explain what astronomers have seen in supernova explosions.
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| 36. | The ultimate fate of all massive stars is a core collapse and some sort of supernova explosion.
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| 37. | But every now and then, we do see a significant change in the skies _ a supernova explosion.
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| 38. | Its outer layers probably were blown away by the supernova explosion that gave birth to the black hole.
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| 39. | Because they are so faint and are obscured by Earth's atmosphere, very distant supernova explosions are rarely seen.
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| 40. | A supernova explosion at a distance of 26 light years will reduce the ozone column density by half.
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