"A photon is a particle. That just means it's a small part. It's a quantum of light or other electromagnetic radiation. In the case of stars, it's light. Futon is the thing you sleep on, by the way." Hartley wasn't sure why he was lecturing, but Bill didn't seem to mind and, hey. He was better at that than actually making conversation.

"Stars have a lot of mass. They are giant and heavy, so that would make them collapse inward. However, because they have that light pressure, the photon energy, inside them, it pushes back outwards. So they are in balance, as I said." Hartley lifted his hands to demonstrate by linking them. "Push and pull. Like yin and yang in a lot of Eastern philosophies."