Astronomers have long struggled to pin down how long a day lasts on Venus, but new research suggests the difficulty stems not from flawed measurements but from real variations in the planet’s spin.
In a new study, scientists used a massive radar system to bounce lightwaves off our neighboring planet over the course of more than a decade. As a result, the researchers were able to measure how tilted Venus’ axis is, how big its core is, and how long it takes the planet to complete one full rotation.
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