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That makes an assumption that the flare was unidirectional. If it's a beam, it could be that Earth was in the beam for an hour, but its duration is anything (like, 1M years)

This is something awesome to consider. Perhaps we only passed through the beam. Perhaps the beam itself was rotating.

The beam would have to be godlike collimated to make any of the relevant velocities enough to take us trough it in a few hours.

Things that far away just don't move fast.

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