Milky Way Built by Epic Galaxy Crash 12 Billion Years Ago
Scientists just confirmed our home galaxy grew from a massive collision with another galaxy 12 billion years ago, revealing how the Milky Way became the cosmic neighborhood we know today. The discovery shows our galaxy has been growing by absorbing neighbors since nearly the beginning of time.
Our home galaxy didn't form peacefully. The Milky Way became the sprawling collection of 400 billion stars we know today by crashing into other galaxies for billions of years.
Scientists just confirmed one of the biggest crashes happened 12 billion years ago. A galaxy researchers have named "Low-energy-Kraken-Heracles" slammed into the infant Milky Way, fundamentally shaping our cosmic home.
Lead researcher Davide Massari from the Italian National Institute for Astrophysics studied tight-knit groups of stars called globular clusters to solve the mystery. By precisely measuring the ages of these star groups, his team found clear evidence of three distinct galaxy mergers.
The discovery fills a crucial gap in our galaxy's family tree. Scientists already knew about a major collision with "Gaia-Sausage-Enceladus" galaxy 10 billion years ago, but evidence kept pointing to an even earlier merger.
"Finding such a clear-cut signature in the age of globular clusters made us very happy," Massari said. The clusters acted like cosmic fossils, preserving the chemical fingerprints of their original galaxies even after billions of years.
The Milky Way started as a small disc of gas just 800 million years after the Big Bang. Today it stretches 100,000 light years across, built piece by piece through these galactic collisions.
Astrophysicist Luca Casagrande from the Australian National University, who wasn't involved in the study, said younger galaxies near the Big Bang are all much smaller than ours. The Milky Way had to grow through mergers to reach its current size.
Why This Inspires
This discovery reminds us that creation often comes through collision. The very atoms in our bodies were forged in stars that came from these ancient galactic mergers.
Our galaxy continues building itself today by absorbing the Sagittarius Dwarf Spheroidal Galaxy, a process that started 6 billion years ago. In a few billion more years, we might even merge with the Andromeda galaxy.
The research shows how persistence pays off. Scientists debated this ancient collision for years, but precise measurements from the Hubble Space Telescope finally provided the proof they needed.
Understanding our galaxy's past helps us appreciate the incredible cosmic journey that made our existence possible. Every star we see in the night sky carries a story of collision, growth, and transformation spanning billions of years.
The Milky Way's story of growth through connection offers a powerful reminder: even galaxies become greater by coming together.
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Based on reporting by ABC Australia
This story was written by BrightWire based on verified news reports.
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