[ad_1] We have comets and asteroids to thank for Earth's water, according to the most widely-held theory among scientists. But it's not that cut-and-dried. It's still a bit of a mystery, and …
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[ad_1] It's been a long time since a luminous comet to the naked eye has honored the sky of the world. But while we wait for the next spectacular visitor to the …
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[ad_1] July is a busy month to observe the sky. Not only are five luminous planets visible, but three comets and a newly discovered nova are also observable. And it all starts …
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