Good point, Jeff. I'd heard of the story many, many years ago, but had forgotten it was written so long ago.

However, I'd be surprised if they were considered worlds in the actual planet sense.

ETA Having checked Wiki, it seems they were! I must get hold of a copy and read it some day.

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If you could touch the alien sands, and hear the cry of strange birds, and watch them wheel in another sky, would that satisfy you?