Stars
Balls of gas glowing by nuclear reactions
Big variety of size, distance, spectrum
- main sequence blue-white (Sirius A)
- main sequence yellow (Sun)
- red giants (Aldebaran), supergiants (Betelgeuse)
- yellow supergiants (Polaris)
- white dwarfs (Sirius B)
Red stars look good in binoculars
Point sources, so twinkling