![]() The new study ramps up the rate considerably, suggesting four objects of that size smacked into Earth in the last million years. Generally speaking, researchers estimate that a space rock at least 0.62 miles (1 km) wide hits Earth about every 600,000 or 700,000 years, according to Science. Figuring out how often the moon or Mars is pummeled is also difficult, as the rate may vary over time similarly, assessing threatening asteroids has its issues, although scientists can say with certainty that no big asteroids pose a threat to Earth for the foreseeable future. Calculating the impact rates of asteroids is a difficult science, as many incoming space rocks burn up in Earth's atmosphere and wind and water erode the marks left by asteroids that do manage to make it to the ground. ![]()
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