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So would probably better to get out of the galaxy disc, travel -fast- to the other end and dive back into rather that go straight through the galaxy?

Except we can't get to edge of the galaxy quickly.

I guess Hitchhikers guide to the galaxy building space highways destroying everything in the way could be more than a gag after all.

Go up and over, that's only a few hundred light years. To the edge of the disk is 30,000.