In 2021, astronomers observed a massive star in the Milky Way during an unusual explosion called supernova 2021yfj. The study explained that the star had already lost its hydrogen and helium layers before the collapse. Even the silicon and sulfur parts were removed, giving scientists a chance to see deep inside. The lighter elements stayed at the surface while the heavier ones were found near the center. The research, published in Nature, was described as an epochal moment because it gave credible proof of long-held theories about how stars are built. Experts said the results offered an insightful and established explanation of stellar life cycles, making the discovery notable for the study of space.

The finding also raised new questions. Some specialists believed that the star lost its layers because of strong activity in its last stage, while others thought a twin star pulled them away. The research gave a lucid confirmation of old models but also showed conundrums that remain unresolved. Astronomers warned that such a clear view may not appear again soon, since these explosions are rare. Still, the study is expected to play a significant role in explaining how exploding stars spread elements that form planets and life. Many experts described the work as a remarkable and substantial step in understanding the complex history of stars and their evolution.