On February 2, 1909, Robert Goddard made a revolutionary breakthrough in his notebook: liquid oxygen and liquid hydrogen could achieve 50% efficiency in converting heat energy to kinetic energy for rocket propulsion
Sixty-seven years ago, a slender rocket carried America's first satellite into orbit, discovering a mysterious feature of our planet that would change our understanding of space forever
Fifty-four years ago, a Saturn V rocket lifted off carrying three astronauts determined to prove America could still reach the Moon after the near-disaster of Apollo 13
Twelve years ago, South Korea successfully launched a satellite using its own launch vehicle and facilities for the first time, marking a crucial milestone in its journey to space independence
Twenty-two years ago, the crew of Space Shuttle Columbia awakened to John Lennon's 'Imagine' and shared a profound message about unity and peace that would become part of their enduring legacy
Thirty-nine years ago, the loss of Space Shuttle Challenger and its seven crew members forever transformed our approach to spaceflight safety and risk management
