Artemis is the US National Aeronautics and Space Administration’s (NASA) program to land humans on Mars. Artemis’s step-wise approach will help us relearn what we knew during the Apollo days and explore the technological advances since then. The last time humans left Earth's orbit was nearly 50 years ago when Apollo 17 went to the moon. That mission lasted less than two weeks; a Mars mission will take months to years, so almost everything must be re-engineered for this new objective.