Once in a lifetime: Transit of Venus set for June 5-6
Summary: The planet Venus moved directly between the Earth and the sun - and will not do it again for another century.
Image 7 of 15

Venus transits usually occur in pairs, once per century. This 2004 photo catches a plane that appears to be streaking toward Venus.
NOTE: If you want to see the transit - DO NOT STARE at the sun. Use some kind of eye protection such as welder's glasses. Here are some eye safety techniques.
Source: NASA
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Hmmm,
Oh Really
Good grief. The purpose of the Mayan calendar was
Funny
Twice in a Lifetime. . .