At the point where the Moon’s gravitational pull of the astronaut is stronger than that of Earth’s
"G\\frac{M_E m_A}{x^2}\\le G\\frac{M_M m_A}{(L-x)^2}"
"\\frac{5.98\\times 10^{24}}{x^2}\\le \\frac{7.36\\times 10^{22}}{(3.84\\times 10^8-x)^2}"
"9\\times(3.84\\times 10^8-x)\\le x"
"x\\geq\\frac{9\\times 3.84\\times 10^8}{10}=3.46\\times 10^8\\:\\rm m"
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