Why Artemis II splashdown is trending

<p>NASA expects Artemis II to splashdown at 8:07pm EDT Friday in the Pacific Ocean near San Diego. CNN's Ed Lavandera explains why this could be the most challenging part of the astronauts’ 10-day mission to circumnavigate the moon. Discover more videos, including live streams and exclusive storytelling, on our <a href="https://www.cnn.com/watch">Watch</a> page.</p>