How did the diagram in that children’s encyclopedia get there, showing the orbits of the “10th planet,” and the “dead star?”

This was a mistake made by an astronomer who was privy to this secret information and had numerous such diagrams in his files. And this was sent out inadvertently by a secretary without his knowledge, and he himself never followed up on the actual end product and was never aware this diagram was out in the public. So this was totally an accident, although it did have divine assistance. So the reason it occurred was due to our helping to create the conditions within their minds to allow an inadvertent slip to be revealing, and this planted the seeds for others to find, as has been done by your compatriot. So rather than be a silly notion or a grasping of straws as you might feel at first blush, this is a profound, divinely orchestrated revelation, and one of many that have been put into motion and have kept humanity informed in various ways at key moments throughout history so they can look beyond the current borders and reach for new insight and higher awareness. This is one such moment coming together for you. This diagram is both accurate and useful as an example of divine workings. Under normal circumstances, a top-secret document would never end up in a child's encyclopedia visible to the public, especially not in teaching material given to many, many, students to plant seeds of awareness within them, if only subconsciously.