Here's Buzz Aldrin with a subtle message about space travel

Here's Buzz Aldrin, the second person to ever walk on the moon, wearing a frankly amazing T-shirt at Comic Con this week.

Mr Aldrin was on a panel moderated by actor Seth Green talking about, as he put it, "NASA's giant next leap - Mars." Mr Aldrin also found time to do a Facebook Q&A yesterday where he revealed he thinks humans will visit Mars within the next 30 years, writing: "I believe it may take us until just before 2040 which is just two decades from the anniversary of landing on the moon."

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