CultureHappy Space Exploration Day: Celebrating The 40th Anniversary Of Viking 1 Landing On Mars Although July 20 marks Space Exploration Day, it is especially important in 2016, because it marks the 40th anniversary of Viking 1 becoming the first U.S. spacecraft to ever land on Mars.by Robin Burks
ScienceMars-Bound: Countries And Private Space Firms Raring To Go To The Red Planetby Katrina Pascual