Cygnus the swan looks for a planet

A story about space — Which planet is the best for Cygnus to build her nest? It shouldn’t be too hot, but it can’t be too cold either. — Cygnus the swan wished to find the perfect place to nest. So off she sought along the milky way, in search of a planet she loved the best. The first she tried was Neptune, far, far away from the sun. But the stormy planet was ever so chilly, building a nest there would be ever so silly. So onward she sought towards the sun, perhaps Venus would be the one. But the brightest planet was hot, hot, hot. Should our swan build her nest there? She’d rather not. Then, way over there, she spied a dot. It wasn’t too cold and it wasn’t too hot. The blue planet earth, such a beautiful spot. Building her nest there would be just right.