Ah, so 2029 is the first flyby and 2036 is the end of the world. Good to know. Thanks @neiltyson! http://youtu.be/xaW4Ol3_M1o #NASATweetup
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Ah, so 2029 is the first flyby and 2036 is the end of the world. Good to know. Thanks @neiltyson! http://youtu.be/xaW4Ol3_M1o #NASATweetup