From PBS NewsHour.

Nearly 60 years after NASA sent the first humans to ever land on our moon, the U.S. is going back with a series of increasingly difficult missions. Horizons moderator William Brangham explores the Artemis program and what new discoveries NASA is hoping to find with PBS News science correspondent Miles O’Brien, Casey Dreier of The Planetary Society and retired astronaut and engineer Leroy Chiao.

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