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I failed a test because I said there were only 8 planets and the "correct" answer was 9. The teacher didn't know Pluto had been demoted. Lol
Oh I had a similar experience in elementary school. Our teacher knew and told us that Pluto wasn't a planet anymore but because the textbook was out of date, she told us that if it came up on our tests, consider Pluto a planet anyway.
Oh public school. Always a hoot. Haha
Sounds like they weren't updating their knowledge. We discover a new major solar system body on an average of every ten years now (the last time it was either Ceres or Sedna).
I wonder how the teacher will react to seeing the upcoming Planet 9 (or to them, Planet X) discovery (rumored to be a minor black hole, which honestly sounds terrifying).