4 billion-year-old comet, largest ever seen, set to pass through our solar system
A huge comet with a solid center more than twice the width of Rhode Island is on an orbital path that will swing it inside our cosmic neighborhood, astronomers say. The icy interloper is traveling 22,000 mph from the edge of the solar system toward the sun. In a study published Tuesday in The Astrophysical Journal Letters, scientists said the comet is no cause for concern because it will not pass anywhere near Earth.
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