Astronomers discovered something special orbiting two ancient whitedwarfs: the remains of planets, making this one of the oldest known rocky planetary systems.
Far away in the depths of the Milky Way lie two small, dim stars that are in the final stage of their life. At over 10 billion years old, white dwarfs WDJ2147-4035 and WDJ1922+0233 are among the oldest stars in our galaxy, and recently, astronomers discovered something special orbiting around them: the remains of planets, making this one of the oldest known rocky planetary systems.
One of the stars is very red, showing the presence of sodium, lithium, potassium, and perhaps, carbon. The other star is extremely blue, which is caused by its helium and hydrogen atmosphere. The debris around these stars contains metallic elements, which suggest it came from planetary bodies.
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