It never ceases to amaze me what men in the obligatory white coats can deduce from a still, monochrome, photograph taken of an object at least 200 million miles away!. Their spectrographic analysis can tell us the make up of everything from the rings of Saturn to the million miles long tail of a racing comet. The scientists in question are based at the David Dunlap Observatory in Ontario and for half an hour they regale us with images both real and speculative of our solar system, of the wider universe, stars, nova, super nova - you name it. The visual effects could easily be the inspiration for the titles on the original "Star trek" series as we are given a sensation of moving through space encountering a myriad of objects en route. Knowing now what we didn't then does enable us to poke some fun at the concept of Martian broccoli or the twelve moons of Jupiter (is has dozens and dozens) but that would not be fair on people who made some surprisingly intelligent guesses and drew some spectacularly accurate conclusions from within the limitations of their contemporary technology. The narration is a little pedestrian, but by the end I thought it would be fascinating to see how the skills of these astronomers could capitalise on today's technology. They didn't do so badly fifty-odd years ago and this is an interesting documentary to watch.

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