40-years-ago-a-comet-came-out-of-the-blue-in-a-surprise-Earth-flyby-Here-s-what-we-know-now-Space-com-hatinco.com

40 years ago, a comet came out of the blue in a surprise Earth flyby. Here's what we know now. - Space.com In a way, it was like a call to arms for astronomers. Author : Joe Rao

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