They found the same life-form on a dozen worlds, parsecs apart. It was a tall, woody plant that was virtually identical to an oak tree. Even more strange, the samples weren’t merely the same species but were cuttings of the same plant.
Anthropologists, astronomers, and botanists debated for decades about how they could’ve traveled so far with no other signs of alien settlement.
Finally, they found a distant planet dominated by a single massive tree. Its branches reached up into the sky and disappeared like magic.
One of the landing party climbed one and found himself standing on another world.

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