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.
1 Betelgeuse is 640 light years from Earth. 2  It is classed as a red supergiant and is the tenth brightest star in the night sky. 3  As part of the Orion constellation Betelgeuse can be easily found in the night sky through most of the year.