You can expect a ghostly green blob to grow brighter in the sky near Orion in the coming days, as Comet 46P/Wirtanen makes its closest approach to the Earth in 20 years this weekend.
You can expect a ghostly green blob to grow brighter in the sky near Orion in the coming days, as Comet 46P/Wirtanen makes its closest approach to the Earth in 20 years this weekend.
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