The Artemis II Orion spacecraft is expected to splash down later today (April 10) as the world waits to welcome back the mission's record-setting crew. So far, the Artemis II moon mission has been a tremendous success, but this final leg of the journey has some experts concerned.

There's an issue with the Artemis II heat shield, which is meant to protect the astronauts from the blistering heat of reentry. NASA is confident that a tweak to the reentry path is enough to mitigate the heat shield problems observed during the Artemis I test flight, and to keep the astronauts safe today.