Fifty\u002Dthousand years ago, the Sahara Desert was wet and fertile. The Stone Age in Africa was just beginning, and the world’s first sewing needle was invented.…
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Other “long-period” comets may take as much as 250,000 years to revisit the center of the solar system. Those intrepid bodies operate on orbits that take them to the system’s distant outskirts – often 50,000 times farther than short-period comets. Those long-period comets compose the Oort cloud, or a band of cometary debris on the fringes of the solar system.The frozen core of a comet, known as a nucleus, is usually less than 10 miles wide.
At that point, it was orders of magnitude too dim to be seen with the naked eye . By November, it had brightened to the point of almost being visible to the highest-quality binoculars from dark areas. It was found to have a period of roughly 50,000 years.It is believed that C2, or diatomic carbon , is present in the head of the comet. When excited by incoming solar radiation, it emits photons at wavelengths we see to be green.In a land far, far away.
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