Isaacman pointed to hydrogen leaks on Artemis I and helium flow problems on Artemis II as signs that a three‑year gap between launches is not sustainable. When teams only fly every few years, he said, they lose "muscle memory" — the routine, hands-on experience required to handle a complex rocket safely and efficiently.
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The images of the Exposed Cranium Nebula suggest multiple episodes of stellar outbursts. A dark lane runs straight through the middle, splitting the glowing cloud into two hemispheres, reinforcing its brainy likeness.，更多细节参见51吃瓜
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