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Ancient Asteroids Hint at Exoplanets in White Dwarfs

3/28/2025

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Summary

Story summary

White dwarfs, known for their intense gravity, usually boast atmospheres rich in hot hydrogen and helium, effectively banishing heavier elements. Yet, intriguing cases like van Maanen 2 reveal contamination from asteroid remnants, hinting at ancient planetary activity. Remarkably, the first signs of exoplanets emerged as early as 1917, long before today's discoveries.

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Story summary

White dwarfs, known for their intense gravity, usually boast atmospheres rich in hot hydrogen and helium, effectively banishing heavier elements. Yet, intriguing cases like van Maanen 2 reveal contamination from asteroid remnants, hinting at ancient planetary activity. Remarkably, the first signs of exoplanets emerged as early as 1917, long before today's discoveries.