Part I: Can inertia make us move? Introduction.- Inertia and inertial reference frames.- Gravitation and weightiness.- Part II: Is weightlessness without gravity? Introduction to Part II Free fall and weightlessness.- Free fall trajectories.- Free fall in the Universe.- Part III: Should one dwell on microgravity? Introduction to Part III Microgravity.- Means to generate microgravity.- Interest of microgravity.- Part IV: Physiological effects of weightlessness Introduction to Part IV General considerations on Life science research.- Physiological effects of weightlessnes.- Bone demineralization.
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