Hearing and tasting colours: the multisensory mystery of synaesthesia

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For around 4% of the population, the concept of colour is much more than a stimulation of photoreceptor cells: those who experience synaesthesia are able to hear colours, or associate colours with letters, numbers and even music. The word synaesthesia comes from the Greek ‘syn’ (meaning union) and ‘aesthesis’ (meaning sensation). Therefore, this rare condition […]

Stars and their Colours

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Abstract Stars are often described in terms of their colour. Sentences like “Betelguese is a Red Supergiant” and “The Sun is a Yellow Dwarf” paint an image, but there is also a great deal of physics behind them. Stars emit light in a way similar to black bodies. The wavelength of electromagnetic radiation that a […]