One of the longest running series of anime, featuring giant robots (mecha), the series first aired in 1979 with Mobile Suit Gundam (the First Gundam). Developed principally by Yoshiyuki Tomino, along with a changing group of Sunrise creators who went under the collective pseudonym "Hajime Yatate".
Gundam is the name or nickname of several mobile suits or mobile fighters. The Development of the series has seen the use of calendar systems or timelines. Common to all Gundam calendar systems is a basic premise that Earth having established space colonies within the Solar System eventually engages in an armed conflict against them. The majority of Gundam works, take place in the Universal Century calendar system.
Gundam Reference on Wikipedia
Gundam Official Website
Gundam Official Website (Japanese)