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A group of astronomers from the Yunnan Observatories (YAO) of the Chinese Academy of Sciences and the Australian National University have collectively found a binary system that is ejecting a standard envelope.

Scientists have successfully observed a common envelope evolution, which has long been believed to be a crucial step in binary star system formation for the first time. Binary stars are networks where two stars circle each other at a short distance. The studies were published in a research paper that was circulated in the Monthly Notices of the Royal Astronomical Society.

Scientists have discovered a familiar envelope originating out of the star system at a speed of 200 km per second and observed the shell enlarging further. The standard envelope is created when one of the stars in a binary system starts forfeiting its mass to its partner star and then widens in size. This results in the system becoming unstable and ultimately causes the collision of the two stars into a single object. If a familiar envelope is successfully released, then the two stars do not unify into a single object, and that results in the creation of extremely rare stellar objects such as Type Ia supernovae, double black holes, and double neutron stars.

In the case of J 1920, a successful ejection of the common envelope occurred almost 10,000 years ago. While scientist B. Paczynski had created a theory regarding the standard envelope in 1976, scientists had not been able to observe one before.