Centuries: 5th century - 6th century - 7th century
Decades: 500s 510s 520s 530s 540s - 550s - 560s 570s 580s 590s 600s
Years: 550 551 552 553 554 555 556 557 558 559 560
... fact arisen in space, or was designed much nearer to home.
Although this is currently a speculative field, the absence of life in the rest of the Univer ...
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