Admirers of Neil Armstrong and space exploration have a chance to own artifacts and mementos that belonged to the global hero who became the first human to walk on the moon.The personal collection of Armstrong, who passed away in Ohio 2012, will be offered for sale in a series of auctions handled by Dallas-based Heritage Auctions, beginning Nov. 1-2 and continuing in May and November 2019.The collection includes a variety of artifacts from Armstrong's 1969 lunar landing and private mementos. Moreover, other items that went to the moon with Armstrong include a U.S. flag, a United Nations flag…