![]() ![]() It's thisfireball that scientists observe. Theexplosion sends the stellar gutsspewing away at 20 million mph (10,000 km/sec) in a fireball that's abillion times brighter than the sun, the researchers say. When amassive star, weighing at least 10 suns, runs out of nuclear fuel, it cancollapse under its own weight, triggering an explosion called a supernova.
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