Someday it may be easier to get an autograph from someone who’s been to the Moon but until then — here are two rare opportunities.

Buzz Aldrin is signing Mission To Mars at the Barnes & Noble in Santa Monica tonight at 7:00 p.m.

And on Monday, July 28 he’ll be in Glendale at the Americana Barnes & Noble at 7:00 p.m.

In between, you’ll find Aldrin at the San Diego Comic-Con.

Buzz Aldrin signing for fans young and old in London last March.