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Small-Scale Question Sunday for February 12, 2023

Do you have a dumb question that you're kind of embarrassed to ask in the main thread? Is there something you're just not sure about?

This is your opportunity to ask questions. No question too simple or too silly.

Culture war topics are accepted, and proposals for a better intro post are appreciated.

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Obviously a star decelerating into our solar system would’ve been immediately noticeable since at least the late 19th century, but solar sails or their magnetic equivalent could also be used to decelerate, and this is probably much less noticeable.