540 Months and Counting
By Sandy Wood

Today's my birthday, so I'm turning the tables by giving you a gift: an easier-than-most mentalfloss.com Brain Game Free-for-all Friday challenge. Good luck!
Thirty-nine years ago today, the Mariner 10 became the first spacecraft to visit which planet in our Solar System? Here is the ANSWER.
Thirty-nine years ago today, the Mariner 10 became the first spacecraft to visit which planet in our Solar System?
ANSWER: MERCURY.
Thanks for playing, and have a great weekend!