The stellar classification scheme orders stars based on decreasing temperature and luminosity, with our Sun classified as a class G star. Stars that could potentially support habitable planets likely fall within the classification range that includes our Sun.

1. The stellar classification scheme, ___________, is a
temperature, luminosity - ordered sequence, with both
temperature and luminosity decreasing.
In this scheme, our Sun is a class ______ star.
Stars that might have habitable planets probably fall within the
classification range ______.