Lanes of young stars gas and dust that wind outward from the central region of spiral galaxies can be identified as

Spiral arm

Explanation:

Spiral galaxies are huge collections of billions of stars, most of which are flattened into a disk shape, with a spherical, glowing star bulge at its center. Inside the disc, there are typically shiny arms where younger, shinier stars, gas and dust are found. These arms move away from the center in a spiral pattern, giving the galaxies this name. Spiral galaxies look a bit like holes, or like water running down a drain. They are some of the most beautiful objects in the sky.

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explanation:

i'd say that the moon rock is about 2.2 billion years old.