Nasa said the launch of Artemis III will take place "no earlier than" 2027. But, experts believe 2028 is the earliest possible date.
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Hostilities between the two sides have been ongoing for months, yet the answer to who started the aggression depends on who you ask.
"When you regain these core competencies and you start exercising your muscles, your skills do not atrophy," he said. "It's safer. And yes, you are buying down risk, because you're able to test things in low Earth orbit before you need to get to the moon, which is exactly what we did during the Apollo era."
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