nbcnews: 8.8 billion habitable Earth-size planets exist in Milky Way alone (Photo: AP Photo / NASA / Ames / JPL-Caltech) Space is vast, but it may not be so lonely after all: A study finds the Milky Way is teeming with billions of planets that are about

nbcnews: 8.8 billion habitable Earth-size planets exist in Milky Way alone (Photo: AP Photo / NASA / Ames / JPL-Caltech) Space is vast, but it may not be so lonely after all: A study finds the Milky Way is teeming with billions of planets that are about

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