• Aurora Borealis, these would be wonderful to see.

  • Shooting stars every know and then? Even better would be the occasional meteor shower.

  • The brief flash of a distant pulsar.

  • Perhaps most intensive: Have a star explode into a nova in the sky. (Seeing the full majestic-ness of a supernova would mean that planet would be consumed, so perhaps not that large of an explosion haha)