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This is Scientific American's 60-second science. I'm Christopher in Talata.

When you look up at the Milky Way, you're gazing at the galactic equivalent of Rome,

a metropolis of stars with layers upon layers of history, just like the Eternal City.

So says the astronomer Hans Walter Ricks.

There were glory days.

There were disasters.

And all of these things kind of happened in the life of galaxies.

And the Milky Way is just the one galaxy.

We can look at star by star.

And so you can kind of see individual episodes in actual detail.

Now Ricks and a colleague at the Max Planck Institute for Astronomy in Germany have indeed

gone star by star, determining the ages of nearly a quarter million stars in the Milky Way.

That work has allowed them to reconstruct some of the major life events in the galaxy's

evolution over its 13 billion years of existence.

What it showed is that indeed the youth and childhood of the Milky Way was turbulent, but actually

afterwards, we've lived an enormously sheltered life compared to most other galaxies.

Gas drizzled in, and the suburbs grew peacefully and sprawled.

...