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The 21-cm line transition for atomic hydrogen results from a spin-ﬂ ip transition for the electron in the parallel state of the n = 1 state. What temperature in interstellar space gives a hydrogen atom enough energy (5.9 - 10^-6 eV) to excite another hydrogen atom in a collision?

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The 21-cm line transition for atomic hydrogen results from a spin-ﬂ ip transition for the electron in the parallel state of the n = 1 state. What temperature in interstellar space gives a hydrogen atom enough energy (5.9 - 10-6 eV) to excite another hydrogen atom in a collision?