Galaxies That Age Backwards: The Reverse Aging Mystery
Автор: Astro Spark
Загружено: 2026-01-05
Просмотров: 766
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What if some galaxies don’t age the way we thought they did?
For decades, astrophysics has accepted a simple idea: galaxies form from the inside out. Their centers collapse first, forming old, metal-rich stars, while younger stars appear later in the outer regions. But recent high-resolution observations have revealed something deeply unsettling.
In some galaxies, the pattern is completely reversed. Younger stars are found at the center, while the outer regions are dominated by much older stellar populations. In extreme cases, the outer disk appears entirely “dead,” with no ongoing star formation at all.
This phenomenon, known as the reverse aging problem, challenges our understanding of galaxy formation and evolution. Scientists have proposed several explanations, ranging from environmental effects and gas stripping to late-stage gas accretion and black hole feedback — but no single theory explains every case.
So what really causes galaxies to age backwards?
Is it their environment, their history, or something we still don’t understand about the universe itself?
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