Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. NASA Looking at Plans for a New Lunar Landing Ken Schwartz Tuesday was the deadline for the commercial space industry to give NASA its proposals for an all-new 21st century lunar landing system as the United States strives to return to the moon within five years. No one has been on the moon since December 14, 1972 when Apollo 17 took off from the lunar surface. It was the end of an era that began in July,1969 when the entire world held its breath to watch Neil Armstrong make that "giant leap for mankind." NASA has celebrated the 50th anniversary of the first moon landing by not just looking back, but looking forward to Mars. But the first stop on the way to Mars is a return trip to the moon. Exploring the moon and living on it for extended periods in the late 2020s is a what NASA calls "practice ground" for learning to live on Mars in the 2030s. "At the moon, we will learn how to live and operate on the surface of another celestial body where astronauts are just three days from home and prove the technologies we need before sending astronauts to Mars, which can take up to three years roundtrip," NASA spokeswoman Cheryl Warner tells VOA. NASA called its 1960s moon mission Apollo. The 21st century moon program is dubbed [1]Artemis -- the Greek god's twin sister. References 1. https://www.nasa.gov/specials/artemis/ .