The 300-year-old mystery of why Venus causes the ‘Black Drop Effect’

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We can see Venus pass in front of the sun once every one hundred and twenty years. Ever since it’s been observed, a strange thing has been happening. Instead of appearing as a dark circle moving across the sun, Venus formed a tear drop shape that slowly oozed onto the solar disc. It took three hundred years for scientists to understand the Black Drop Effect.
Via io9.com

Tags: astronomy black drop effect science transit of Venus Venus