CAPE CANAVERAL, Florida, Mar 7: The first of two comets heading toward the sun this year made its closest approach to Earth on Tuesday and will be visible in the Northern Hemisphere beginning on Thursday. Skywatchers in the Southern Hemisphere have been able to see Comet Pan-STARRS for weeks at twilight, even without binoculars or a telescope. The comet came about 100 million miles (161 million km) from Earth on Tuesday. (agencies)
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