Ok, right from the first time you tried to walk you discover gravity, stop, wobble, plop on your bum, right ?

At some point in your childhood you have swung something around on a bit of string, right ?

You understand if you drop a coin it falls to the ground, right ?

You know that the sun is really, really, really hot, right ?

So what stops you mythical planet from dropping into the sun ?

what stops it from vaporizing down to bed rock ?

Easy, it's a myth from the not too fertile imagination of one Nancy Lieder...