| 11. | After the supernova explosion, the ejected material expands and becomes a supernova remnant.
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| 12. | Designated SN 1998bu, this was a Type Ia supernova explosion.
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| 13. | Within the Milky Way galaxy, supernova explosions occur on average once every 40 years.
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| 14. | Another potential problem for a Weakless Universe is that supernova explosions are necessarily neutrinoless.
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| 15. | Supernova explosions abound; galaxies collide; black holes swallow entire stars.
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| 16. | These stars undergo carbon fusion, with their lives ending in a core-collapse supernova explosion.
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| 17. | NGC 1187 has hosted two supernova explosions since the 1980s.
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| 18. | In 1987 Kamiokande also detected neutrinos from a supernova explosion outside the Milky Way.
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| 19. | They are thought to be born in the collapse of normal stars in supernova explosions.
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| 20. | Furthermore, the expanding shock waves from supernova explosions can trigger the formation of new stars.
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