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.
The outer layer of sun''s atmosphere is made up of thin hot gases.It is called Corona.Corona is visible only during the total eclipse of the sun or with a special solar telescope called Coronagraph.1 0.he outer layer of sun''s atmosphere is made up of thin hot gases.It is called Corona.Corona is visible only during the total eclipse of the sun or with a special solar telescope called Coronagraph. 1 0.