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Why is it important to know this now? In six billion years, astronomers will change their opinion about what will happen during the collision a billion times. They will say that there won't be a collision at all. They will say that it won't be dangerous. If it does happen, then closer to the actual collision (approximately in 5.9999999 billion years), people will already be thinking about what to do and how to deal with it. But right now, this is a completely useless topic for discussion.
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I sometimes confuse psychologists and psychiatrists.
Well, that's just in words.