Editing Skein of Worlds:The Material Plane (section)

=== The Positive Energy Spheres ===
The positive energy spheres, or suns, are the source of most light on the material plane. They're about the same size as a planet, but don't have much in the way of a surface or native life. Suns are mainly giant vortices into the positive energy plane.

If a planet was close enough to a sun, it might gain the minor positive-dominant trait. The sun would be very large in the sky, and even at night it wouldn't be as dark as in other places. Such a place wouldn't necessarily be any hotter though. Worlds with the positive-dominant trait would be hard places for normal civilizations to flourish since the forces of nature would be so much stronger.