Question

pluto was downgraded from a planet to what by the international astronomical union?
a blue planet
a white dwarf
a dwarf planet
a solar star

Explanation:

In 2006, the International Astronomical Union reclassified Pluto, redefining the criteria for a planet. Pluto did not meet the requirement of clearing its orbital neighborhood, so it was reclassified to a new category.

Answer:

A Dwarf Planet