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On the hunt for small asteroids that may melt a city or larger creatures that could sterilize the Earth's surface, astronomers have discovered a new possible danger called 'Planet Killer'.

United statesTracy beckerVictorm blancoDark energy cameraResearch instituteSpot possibly dangerousPlanet killerCerro tololo inter american observatoryAstronomical journalSouthwest research instituteFresh craterMars createdMeteorite impact reveals chunksPlanet killer asteroid hit theNear earth object surveyorWatch out