Plant diseases can be infectious (transmitted from plant to plant) or noninfectious. Noninfectious diseases are usually referred to as disorders. Common plant disorders are caused by deficiencies in plant nutrients, by waterlogged or polluted soil, and by polluted air.
Such refinements in the images of Betelgeuse's atmosphere has been helping to resolve the mystery of how massive amounts of dust and gas are expelled from red supergiant stars, an important source of enrichment for the interstellar medium.
And, in fact, if there are any astronomers around when it does blow, they will be extremely thrilled to have a relatively nearby supernova to study. Artistâs concept showing star Betelgeuse (center), with a series of arcs immediately to the left of the star.