Free Astronomy Magazine November-December 2021

35 NOVEMBER-DECEMBER 2021 ASTRO PUBLISHING Let’s go back to the original, more precisely to the ninth episode, “Or- deal”, all based on a nightmare of Foster who sees himself kidnapped by aliens, dressed in their spacesuit and subjected to their breathing technique, which involves filling hel- mets and lungs with an oxygenated green liquid. Although the plot of the episode is not that great, the function of that liquid offers an opportunity to hint at the consequences on the physical that the impressive accelerations typical of science fiction spacecraft would entail. On Earth, we daily experience accel- eration due to gravity, but we often don’t realize it. We are all attracted