Story perspectives

Milky Way: 13.6 Billion Years of Cosmic Evolution

9/12/2025

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Summary

Story summary

The Milky Way galaxy formed around 13.6 billion years ago, shortly after the Big Bang.
It measures about 100,000 light-years in diameter and 1,000 light-years thick at its center.
The galaxy hosts 100 to 400 billion stars and approximately 100 billion planets.
Our Solar System orbits the galactic center at 828,000 km/h, completing a revolution every 230 million years.
The Milky Way is set to collide with the Andromeda Galaxy in about 4.5 billion years.

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Story summary

The Milky Way galaxy formed around 13.6 billion years ago, shortly after the Big Bang.
It measures about 100,000 light-years in diameter and 1,000 light-years thick at its center.
The galaxy hosts 100 to 400 billion stars and approximately 100 billion planets.
Our Solar System orbits the galactic center at 828,000 km/h, completing a revolution every 230 million years.
The Milky Way is set to collide with the Andromeda Galaxy in about 4.5 billion years.