I bet the sky would look very different to them, too. If they did evolve eyes at all, it would probably only be in order to detect thermal radiation from other

I bet the sky would look very different to them, too. If they did evolve eyes at all, it would probably only be in order to detect thermal radiation from other life forms on the planet; so infrared, microwave, and/or radio frequencies, but not visible light. They may even be able to plainly see the cosmic microwave background with the naked eye. It might even be blindingly bright to them.