First map of Milky  galactic graveyard 

Sometimes remnants of ancient stars are ejected from the galaxy.

The Milky Way is a massive cemetery. Stars are born, burn out, and die, yet they do not simply disappear.

Massive stars that died billions of years ago in the Milky Way went supernova and changed into two types of things.

The intensity of the explosion blew away their outer layers.

The remaining cores either died as highly compact neutron stars or imploded in on themselves to produce black holes.

Scientists refer to what remains of these ancient stars as the "galactic underworld."

After effectively turning back the clock to learn how and when these early stars were born, lived, and died,

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