This is John Batchel, conversation with Dr. Ken Croswell, the astronomer writing for sky and telescope magazine, about a new discovery in the cosmos, in our galaxy, in the Milky Way, the barred spiral galaxy of the Milky Way.

And the discovery is exciting because we can see it here in the solar system and we can see it in the center of the galaxy

thousands of light years, millions of light years away.

The phenomenon is the Trojan asteroids of Saturn

and Jupiter become the Trojan stars of the Milky Way,

the barred spiral galaxy of the Milky Way.

Here Ken explains.

There's much more of this tonight.

Fresh information.

Enjoy.

You might think it has nothing to do

without what we're talking about.

Jupiter actually has quite a lot about what we're talking about,

because Jupiter has Trojan asteroids,

and the Lucy mission is going to explore a number of those

those Trojan asteroids over the next decade.

And let me explain what Trojan asteroids are.

Now, most asteroids in our solar system orbit the sun between the orbits of Mars and Jupiter.

That's the asteroid belt.

But Jupiter's gravity has enticed thousands of other asteroids to orbit in its own orbit around the Sun.

So just as Jupiter goes around the Sun every 12 years, so those Trojan asteroids

go around the Sun every 12 years.

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