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If you're curious how astronomers find & identify a disintegrating planet, here's the full paper.
The planet BD+05 4868 Ab used to be the size of Mercury. Now it's the size of the Moon. In a few million years, it will be gone.
https://iopscience.iop.org/article/10.3847/2041-8213/adbf21 #science #nature #astronomy