A green-hued comet that has been lurking in the night sky for months is expected to be the most visible to stargazers this week as it gradually passes Earth for the first time in about 50,000 years. | Reuters
Comets are composed of a solid core of rock, ice and dust and are blanketed by a thin and gassy atmosphere of more ice and dust, called a coma. They melt as they approach the sun, releasing a stream of gas and dust blown from their surface by solar radiation and plasma and forming a cloudy and outward-facing tail.
This comet last passed Earth at a time when Neanderthals still inhabited Eurasia, our species was expanding its reach beyond Africa, big Ice Age mammals including mammoths and saber-toothed cats roamed the landscape and northern Africa was a wet, fertile and rainy place. NASA plans to observe the comet with its James Webb Space Telescope , which could provide clues about the solar system’s formation.
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