Ready or not, key engine burn puts NASA's Artemis II on path to the moon

Artemis II has officially left Earth's neighborhood, with the Orion spacecraft now on a three-day leg of the deep space journey toward the moon. After NASA polled "go" on translunar injection — or TLI, the key engine firing — flight controllers commanded the maneuver just before 8 p.m. ET on Thursday, April 2, less than 24 hours after the historic mission launched from Kennedy Space Center in Cape Canaveral, Florida. For the U.S. space agency, this moment is the real point of no return in a carefully orchestrated test flight. It's the last major engine firing of the mission. The burn not only pushes the capsule toward the moon, it also serves as the same critical maneuver that will eventually bring the astronauts home. That's riskier than NASA's usual spaceflights. On the International Space Station, astronauts circle Earth every hour and a half. If something goes wrong, they're never more than about 90 minutes from an emergency landing. But on Artemis II, as soon as controllers take this step, NASA has committed to the rest of the mission, save a couple of options for a U-turn, said crewmate Christina Koch. "Wrapping our heads around that is very interesting," said Koch, who is he