Reaction doesn't need mass to push against though. That's why they used to think rockets wouldn't work in space because there was nothing to push against, but you don't need any mass to push against.
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Originally Posted by karnautrahl
That said, there isn't an expert who can guarantee 100% there's noone out there crossing the stars.
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To be fair, no-one has said that, even the professor in the original article. It's just unlikely they have been here.
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