This week, the Inquisitive Iguanas researched what the smallest planet is. The answer is more complicated than you might think, because Pluto
is smaller than Mercury, but Pluto isn't considered a real planet by scientists. It's just considered part of the Kuiper belt which has many other
space iceballs like Pluto in it (similar to the asteroids in the asteroid belt.) So that leaves
Mercury as the smallest true planet. Its diameter is 3,031 miles, about 1/3 the size of Earth. Pluto's diameter is only 1,482 miles. So if you
still count Pluto as a planet, it would be the smallest one!