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We have thoroughly explored our own planet Earth, have imaged many of the other planets from orbit, and we have no clue about any of the other planets that might be orbiting any of the TRILLION other stars in the Milky Way. Your question would be like looking closely at a single spoonful of sand in your sandbox and wondering about the biggest grain of sand on any of the world's beaches.

The biggest mountain that we know of is on Mars, Olympus Mons. We know little enough about Venus, just some radar surveys; details about the outer planets are unknown to us. We know nothing about anything outside our solar system, but it is statistically certain that taller mountains exist elsewhere in the galaxy.

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14y ago

What else can I help you with?