I wonder how far a planet has to be from varying star types in order to support life.
If a sun became a supergiant wouldn't the surface get cooler. and the planets would stay put because it doesn't lose mass does it? and then every star is constantly losing hydrogen particles so the planet would constantly get closer and closer to the sun. and a blue star, and white, yellow, red stars. imagine the specifications the species on that planet would have to have in order to survive.
For life that needs water anyway, the distance is always going to be somewhere in a liquid water zone, which varies a little bit depending on the planet's atmosphere. As the star ages though, and output fluctuates, it is possible for a once habitable planet to find itself outside the habitable zone, freezing or boiling to death. Probably a species' only defense against that would be to have enough technology to endure or evacuate and find a new way/place to survive.
