The debate has been going on since I was in the 6th grade about "Planet X", the first "planet" discovered in the "Kyber(?), er Kuiper Belt" which is similar to the asteroid belt but outside the orbit of the planets.
Hmmm. In fact, I remember this (Planet X) was my Show and Tell project in the 6th grade. Well that and the Pioneer 10 space probe.
Science books evolve all the time much like history and geography books. My parents still have a World Book Encyclopedia set where the latest space flight was the Apollo 11 flight to the moon.
Even my career field (weather) has evolved a lot over the past 15 years as it keeps pace with technology.






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