Challenger disaster remembered as Artemis II sits on launch pad

The 40th anniversary of the Space Shuttle Challenger disaster comes as NASA prepares for its next major step in human spaceflight. The Artemis II mission, which will send four astronauts around the moon, is currently on the launch pad at Kennedy Space Center. Like Challenger four decades ago, the rocket is facing freezing temperatures, though officials say modern safeguards, monitoring systems, and launch rules are designed to prevent a repeat of past failures.