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Okay from a lay perspective, though, we've got what we know and we've got what we think, and considering we have yet to conclusively verify the Oort Cloud, any random space chunky with a gnarly trajectory becomes an important subject of scientific experiment. You're right - by "interstellar medium" I mean "shit what ain't from 'round here." This is not the correct use of the term when discussing science but we're talking about RAMA dammit