Episode 23 of 26: Far Out - Cosmic Measurement & Structure
The measurement and scale of the Universe. How far is a star or a galaxy?

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Distances are so vast they are described in light years - the distance light travels in a year. Nearby stars are measured by trigonometry - the technique of parallax. Farther out, astronomers use so-called "standard candles". The pulsing and luminosity of Cepheid Variable stars works up to 90-million light years.

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SPACEFILES: An enthralling overview of the Solar System, our Galaxy and the greater Universe. In a flow of superb CGI, glorious images from deep space and incisive writing, 26 beautifully crafted episodes deliver the compelling fundamentals of space, astronomy and cosmic exploration.

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