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How long is the solar system’s longest day? Venus has the answer – NBC News

Data obtained by bouncing radio waves off Venus — treating it, as one scientist said, like a giant disco ball — is providing new insight into Earth’s closest neighbor….

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Data obtained by bouncing radio waves off Venus treating it, as one scientist said, like a giant disco ball is providing new insight into Earth’s closest planetary neighbor, including a precise calculation of the duration of a Venusian day.
The study also measured the tilt of the Venusian axis and size of the planet’s core, allowing for a deeper understanding of an enigmatic world sometimes called Earth’s ‘evil twin.’
It was already known that Venus has the longest day the time the planet takes…

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