Noun. 1. invariant-a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it. characteristic, feature-a prominent attribute or aspect of something; the map showed roads and other features; generosity is one of his best characteristics.
The part of the sun that is going to emit the most visible light is going to be the Photosphere.he photosphere is the layer of the sun that emits visible light.  The light is emitted by hydrogen atoms and is bright red. Edit. Share to: Answered. In Astronomy.
#2. John Creighto. Visible light has more energy per photon but the light that comes from the sun is spreads out so it is at a much lower intensity then it would be from a black body emission. If you think that infrared light is hotter then try putting you hand on a light bulb, a red hot stove burner or a white hot welding rod.