If you put Earth out beyond Neptune, you wouldn't be able to call it a planet because it couldn't clear its zone.

The Kuiper belt region, which I call the third zone because it lies beyond the rocky terrestrial planets and beyond the giant planets, is a bizarre frontier.

I put up my thumb and it blotted out the planet Earth.

The Kuiper Belt is the largest mapped structure in our planetary system, three times as big as all the territory from the sun out to Neptune's orbit.

Why would you listen to an astronomer about a planet?

We call it seeing in the dark.