my main criticism be quite simply that it isn not long enough or detail enough . i would have love to see more of everything represent the building of the vessel and the engineering and the training and the first lift to orbit and preparation for departure and venus orbital injection and everything . i would have like to see more of the first leg and venus to earth and instead of zip there like a n°10 corporation bus . in fact and i would have like to see a series on the scale of earth story make of this and with a full hour dedicate to every planet and maybe another to the loop around the sun . a it be and i be leave hungry . on the other hand and i do understand budget and viewer attention span . re the science represent let be fair about the speed of light time lag represent they do mention at the beginning that there be a lag in conversation and but they let this evaporate once they reach the outer planet . some kind of conversation have to be present to the viewer and and we have to assume that the lag be edit out for the sake of palatability while so no complaint there . but zero for noisy spaceship . the only film in which spaceship make no noise be kubrick 2001 and and even then he cop out by use the noise of the crew breathe in their helmet which be pretty effective . i wish the maker of space odyssey have realize just how eerie the sight of vast rocket motor blast in absolute silence might be but ala and pegasus let out much the same roar a every other cardboard spaceship in every other cardboard scifi film . but the rest of the science be excellent . no complaint there and in fact praise for bring out the radiation problem as well a they do . i just hope that have do this film would not discourage the bbc from make a really detailed version and but i suppose that not for next week or next year either .