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How do we figure out the mass of a planet if we can’t even see it? We don’t measure the planet directly. We measure what it does to its star. A planet pulls on its star through gravity, and that pull makes the star wobble ever so slightly. When the star moves toward us, its light shifts a little blue. When it moves away, it shifts red. That tiny back-and-forth motion tells us a planet is there. And here’s the key. The more massive the planet, the stronger the pull, and the bigger the wobble. So
1:39
How do we figure out the mass of a planet if we can’t even see it? We …
38.4K views1 month ago
TikTokdr.starkid
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