How do scientists know so much about planets so far away?
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They can tell by how much they “wobble” a star what the mass is, they can tell about the interval between dimming the star they orbit around how long it takes them to complete an orbit, they can tell about the light passing through the atmosphere what that might contain. Combining these factors and others allows you to make some assumptions about the planet. https://youtu.be/AnYye_c8rI4
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