NASA video: 'Comet of the Century' ISON passes around sun (VIDEO)

The unpredictable behavior of the ancient ISON comet has scientists scratching their heads, as the world's space agencies had to quickly backtrack from their earlier claim that it had been destroyed in its encounter with the sun.

The 2km-wide relic has been traveling to meet our star for over a million years. But the "dinosaur bone of solar system formation," as senior research scientist at Johns Hopkins University, Carey Lisse, dubbed it, did not shine as bright after its slingshot encounter around the sun on Thursday, forcing scientists and stargazers to conclude the celestial body had lost its tail and nucleus -

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