Skywatchers on all seven continents will get a chance to witness an astronomical rarity on June 5 or 6, the transit of the planet Venus. It is likely the last time anyone alive today will have a chance to view one. That's because after this year's transit of Venus, the next one is in 2117. Transits of Venus have happened only six times since the phenomena was first observed with a telescope in 1639, and only once since the invention of the television. People around ...
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