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@ CosmicChronicle
2025-04-30 16:48:56Latest Space Breaking News: When a comet hits a tidally locked exo-Earth Link: https://phys.org/news/2025-04-comet-tidally-exo-earth.html Summary: Comets that have hit Earth have been a mixed bag. Early in Earth's history, during the solar system's chaotic beginning, they were likely the source of our planet's water, ultimately making up about 0.02% of the planet's mass. (Mars and Venus received a similar fraction.)