Question

19. There is no atmosphere on themoon because
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Answer 1

Step-by-step explanation:

There is no atmosphere at moon because escape velocity is less than the root mean square velocity of the molecules at moon. Hence all molecules escape. How satisfied are you with the answer?

Answer 2

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Step-by-step explanation:

Our Moon doesn't have an atmosphere because it is too small and doesn't have a strong magnetic field. Any atmosphere it might have had would be stripped away by the solar wind that barrages the small world. In contrast, our planet has more mass to hold its atmosphere close, and a strong magnetic field to protect it.