Huge Comet Discovered

A huge comet-like object has been spotted inside the orbit of Neptune. The object, at least 30 miles wide, is on the return leg of a 22,500-year journey around the sun, astronomers announced today.
Cataloged as 2006 SQ372, the interloper is just over two billion miles (3.2 billion km) from Earth, though its elongated trek takes it to a distance of 150 billion miles (241 billion km), or nearly 1,600 times the distance from the Earth to the sun.
The only known object with a comparable orbit is Sedna — a distant, Pluto-like dwarf planet discovered in 2003. But 2006 SQ372's travels take it more than 1.5 times farther from the sun. Its diameter is estimated at 30 to 60 miles (50 to 100 km).
"It's basically a comet, but it never gets close enough to the sun to develop a long, bright tail of evaporated gas and dust," said Andrew Becker of the University of Washington. Comet tails form when solar energy boils material off a comet.
The object is not a threat to Earth, which is good. A comet that size would cause global devastation. For comparison, the asteroid thought to cause the demise of dinosaurs was about 6 miles (10 km) wide. The comet Hale-Bopp, which put on a spectacular display in the late 1990s, is about 31 miles (50 km) in diameter. Yet many comets are just a mile or two wide.

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