Dr Tyson excluded Pluto from the American Museum of National History exhibit because it is considered an icy body and not a planet.
Originally, he identified Pluto as a comet from the Kuiper Belt of Comets, since its composition its mostly ice, and stated that if it came near the sun it would evaporate and grow a tail, an uncommon behavior for a planet.
Eventually, in the 1990s, icy bodies were found in the outer solar system, and the similarity between Pluto and them was evident. The conclusion was that both are made of ice, have similar strange orbits, and cross the orbit of other planets.
Answer: The despreate trek across america is about, Someone stranded near Tampa Bay in April 1528, without ships or hopes of resupply, Alvar Nunez Cabeza de Vaca and 250 conquistadors, set off on an epic cross-country trek that would leave only four alive.
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