They say it’s because they are dark and don’t radiate light. But we have chatted and mapped the course of hundreds of thousands of objects in our solar system that are miniscule compared to a planet. Its mind boggling how many of these things we know about now, I think it’s near a million actually. Some are near-earth objects, but there are others, like Sedna, which go waaaay out into the black. So the question still stands.
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