Comets look like swimming sperms in time-lapse videos

The H-1 camera on board NASA's STEREO-A spacecraft has captured this sequence of the two comets now en route to the Sun: Encke and ISON. They look like sperms trying to fertilize an egg named Earth—which is quite appropriate, given the hypothesis that comets brought life to this planet.

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NASA's explanation:

Dark "clouds" coming from the right are more dense areas in the solar wind, causing ripples in Comet Encke's tail. Using comet tails as tracers can provide valuable data about solar wind conditions near the sun.

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DISCUSSION

Greg the Mad

Oh, look. Earth.

From this distant vantage point, the Earth might not seem of particular interest. But for us, it's different.
Consider again that dot.
That's here, that's home, that's us.
On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there – on a mote of dust suspended in a sunbeam.

And some tons of rock or metal can end it all, in one swift strike.