Question

is the last planet pluto available or not

Answer 1

It is not considered as a planet. Our last planet is Neptune and Pluto is a dwarf planet. In short it is not available.

Answer 2

Pluto is still available but it is not a planet because it doesn't satisfies the properties of being a planet.
A planet should have its own orbit but Pluto's orbit is merged with Neptune's at some places. So Pluto is not considered as planet.


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Hope it helps