2026年2月19日 / 美国东部时间上午11:17 / CBS新闻
美国国家航空航天局（NASA）周四批准工程师们向该机构巨大的太空发射系统（SLS）火箭加注超过75万加仑超冷推进剂，进行第二次”湿彩排”倒计时，以验证泄漏修复情况，并为最早于3月6日的登月飞行扫清障碍。
这次模拟倒计时于周二晚上启动，启动了一系列精心编排的步骤，旨在为世界上最强大的现役火箭做好准备，于美国东部时间周四晚上8:30进行模拟发射。控制人员随后计划进行额外测试，以确保团队能够根据需要重新启动、保持和重启实际发射倒计时，以应对意外问题。
彩排倒计时的初始阶段进展顺利，上午9:35，发射总监查理-布莱克威尔-汤普森（Charlie-Blackwell Thompson）批准开始这一持续数小时的过程，向SLS火箭的第一级加注19.6万加仑液氧和53.7万加仑液氢燃料。火箭的第二级还将装载另外2.25万加仑推进剂。
如果未检测到超出限制的泄漏或其他重大问题，阿尔忒弥斯II号指挥官里德-怀斯曼（Reid Wiseman）、维克多-格洛弗（Victor Glover）、克里斯蒂娜-科赫（Christina Koch）和加拿大宇航员杰里米-汉森（Jeremy Hansen）将于周五进入飞行前医学隔离状态，目标是最早于3月6日发射绕月球远端飞行。
这将是自1972年最后一次阿波罗登月以来首次载人登月飞行，将把机组人员送往比太空历史上任何宇航员都更远的地方。怀斯曼和他的机组人员也将是首批乘坐322英尺高的太空发射系统火箭升空的人——该火箭仅进行第二次飞行，也是首批乘坐猎户座深空载人舱飞行的人。
更重要的是，这次飞行将是迈向2028年阿尔忒弥斯III号任务的重要一步，后者计划将宇航员送往月球南极附近。
NASA最初计划于本月初发射阿尔忒弥斯II号任务。但在第一次湿彩排倒计时期间检测到氢气泄漏。由于需要更换和测试连接推进剂管线与火箭底部的快速断开脐带缆上的可疑密封件，飞行最终推迟到3月初。
周四的第二次彩排倒计时和燃料加注测试旨在验证无泄漏的推进剂加注情况，并让发射团队有机会练习和验证在实际发射倒计时中保持和重启所需的步骤，以便为可能出现的任何问题争取解决时间。
Artemis II moon rocket refueled in practice countdown setting stage for historic flight
February 19, 2026 / 11:17 AM EST / CBS News
NASA cleared engineers to load more than 750,000 gallons of supercold propellants into the agency’s huge Space Launch System rocket Thursday in a second “wet dress rehearsal” countdown to verify leak repairs and clear the way for a flight to the moon as early as March 6.
The practice countdown began Tuesday night, kicking off a carefully choreographed series of steps to ready the world’s most powerful operational rocket for a simulated launch Thursday at 8:30 p.m. EST. Controllers then planned to carry out additional tests to make sure the team can recycle, hold and restart an actual launch countdown as needed to handle unexpected problems.
The Artemis II Space Launch System rocket stands atop pad 39B at the Kennedy Space Center during a second “wet dress rehearsal” fueling test. NASA
The initial stages of the rehearsal countdown went well and at 9:35 a.m., Launch Director Charlie-Blackwell Thompson gave her “go” to begin the multi-hour process of loading 196,000 gallons of liquid oxygen and 537,000 gallons of liquid hydrogen fuel into the SLS rocket’s first stage. The rocket’s second stage holds another 22,500 gallons of propellant.
If no out-of-limits leaks or other major problems are detected, Artemis II commander Reid Wiseman, Victor Glover, Christina Koch and Canadian astronaut Jeremy Hansen will go into pre-flight medical quarantine Friday, aiming for launch on a flight around the far side of the moon as early as March 6.
The grey structure at left is a tail service mast, one of two that feed propellant lines, nitrogen gas, electrical cables and data lines into the base of the Space Launch System rocket (seen here during preparations for the Artemis I launch in 2022). NASA
It will be the first piloted flight to the moon since the final Apollo landing in 1972, carrying the crew farther from Earth than any astronauts in space history. Wiseman and his crewmates will also be the first to ride into space atop the 322-foot-tall Space Launch System rocket, making only its second flight, and the first to fly aboard an Orion deep space crew capsule.
More important, the flight will serve as a major step toward the follow-on Artemis III mission to land astronauts near the moon’s south pole in 2028.
NASA originally planned to launch the Artemis II mission early this month. But hydrogen leaks were detected during an initial wet dress rehearsal countdown. The flight ultimately slipped to early March because of work to replace and test suspect seals in a quick-disconnect umbilical that attaches propellant lines to the base of the rocket.
The second rehearsal countdown and fueling test Thursday was intended to verify leak-free propellant loading and to give the launch team a chance to practice and verify steps needed to hold and restart a countdown to allow time for troubleshooting any problems that might crop up in a reach launch count.
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