By Denise Chow It’s official: The Artemis II astronauts have arrived in the moon’s cosmic neighborhood. The crew’s Orion capsule entered what’s known as the lunar sphere of influence at around 12:41 a.m. ET Monday, crossing into the region of space where the moon’s gravitational pull is stronger than the pull of Earth’s. “That’s a significant milestone on our mission,” NASA flight director Rick Henfling said Sunday in a news briefing. The lunar sphere of influence isn’t a physical or tangible border. Rather, it’s a mathematical boundary that signifies that the astronauts are in the moon’s vicinity. Crossing the threshold is
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