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{"ops":[{"insert":"Interstellar space, far from any stars, is filled with a very low density of hydrogen atoms (H, not H2). The number density is about 1atom \/ cm"},{"attributes":{"script":"super"},"insert":"3"},{"insert":"\u00a0and the temperature is about 3K.\nIn certain region of space, the density of hydrogen atoms is\u00a02 atoms \/ cm"},{"attributes":{"script":"super"},"insert":"3"},{"insert":"\u00a0. Estimate the number of collisions experienced by the spherical interstellar ship of diameter of 260m moving at the 50% of the speed of light in the interstellar space in 1second of its motion.\nGive your result in millions of collisions (10"},{"attributes":{"script":"super"},"insert":"6"},{"insert":") to the nearest tenth. (e.g. For a result of 12 345 678.90 collisions, input 12.3)\nTake the speed of light to be 300000km\/s.\n"}]}
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