"There goes the Sun." The swollen solar disc begins to dim, areas of its surface switching off in ugly black blotches as wide as worlds. Out of the sabotaged star shoots an actinic blue pinprick, arcing around to bear down on Earth, currently host to some one point zero five billion souls. Moving at a respectable and increasing fraction of the speed of light, he'll arrive in just minutes, hitting the Antarctic first, hard enough to punch a hole right from one side of the planet to the other. The shockwave from the supernova will follow a few minutes later. There'll be nothing left but ionised
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