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This news quiz is out of this world

How closely were you tracking this week's news?

Dr. Allan Stern and others hold up their suggestion for a modified US Post Office stamp of Pluto at the Johns Hopkins University Applied Physics Laboratory on July 14, 2015 in Laurel, Md. (Photo by Brendan Smialowski/AFP/Getty)
Dr. Allan Stern (L), principal investigator for the New Horizons mission to Pluto, and others hold up their suggestion for a modified US Post Office stamp of Pluto at the Johns Hopkins University Applied Physics Laboratory on July 14, 2015 in Laurel, Md.AFP/Getty Images

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Kavish Harjai