NASA

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After its history-making trip around the Moon, NASA's Artemis II mission is set to return to Earth later today. The Orion spacecraft carrying astronauts Reid Wiseman, Christina Koch, Victor Glover and Jeremy Hansen is scheduled to splash down off the coast of San Diego at approximately 8:07PM ET. NASA will stream the landing on YouTube and its NASA+ website, as will Netflix and HBO Max. The official broadcast will begin at 6:30PM ET.  

After leaving Earth on NASA's super heavy-lift SLS rocket and spending nine days in space, the most dangerous part of the Artemis II mission still lies ahead. It will take approximately 13 minutes for the Orion spacecraft to complete re-entry. During that time, it will be subject to temperatures of up to 5,000 degrees Fahrenheit (2,760 degrees Celsius). 

Reentry is dangerous for any crewed spacecraft, but is of particular concern here because of a "skip reentry" during the Artemis 1 mission. At that time, the Orion crew vessel briefly used its own lift to "skip" back out of Earth's upper atmosphere before re-entering for the final descent, suffering excess charring in the process. NASA spent months investigating and determined the craft was safe to fly, but Artemis II will take a more gradual approach back to Earth in hopes of reducing its exposure to excess heat. 

Still, this is the first time in 53 years that NASA will need to guide a human crew back from the Moon. Once all is said and done, however, the Artemis II crew will have traveled 695,081 miles (1,118,624 km), captured amazing images along the way and reminded the world what's possible when nations work together.