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These airbursts can still prove deadly. The Tunguska explosion in 1908, which flattened some 500,000 acres (2,000 square kilometers) of Siberian forest, is often thought to have been caused by an airburst from an asteroid or comet some 65 feet (20 meters) wide and 185,000 metric tons in mass - more than seven times that of the Titanic.


Comparing Hartley 2 with the four larger comets thus should help "give us a better picture on what the properties of the primordial comets that seeded the Earth with water and organics might have been like," said Michael A'Hearn, principal investigator for the mission. "We're trying to understand how they might have changed over time to figure out what they might have started like."