Organic molecules found in planetary nebulae at the edge of the Milky Way

Planetary nebulae occupy 90% of the interstellar medium. Previously, scientists believed that the substance

planetary nebulae are atoms, but planetary nebulae serve as sources of molecules for the formation of new stars and planets.

At the end of life, the star loses most of itsmass and becomes a white dwarf: during this period, it usually emits strong ultraviolet radiation. It was believed that this radiation destroys any molecules in the interstellar medium, turning them into atoms. Observation results have shown that this is not the case.

During the work, the authors found in remote fromthe center of the Galaxy in molecular clouds of methanol: they studied 20 molecular clouds in the Cygnus arms and found methanol in all twenty. They were located at a distance of 13 to 23.5 kiloparsecs from the center of the Galaxy, which is much farther than the outer border of the habitable zone - the region with the most favorable conditions for the origin and safe evolution of life, located within 10 kiloparsecs from the center of the Milky Way.

It tells us that in a dying star,spherical until its last phase, after passing through the planetary nebula stage, a very interesting dynamics occurs that changes this spherical shape.

Lucy Ziuris, researchers at the University of Arizona

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