Space is mostly quiet. Data collected by telescopes are most often turned into silent charts, plots, and images. A "sonification" project led by NASA's Chandra X-ray Observatory and the Universe of Learning transforms otherwise inaudible data from some of the world's most powerful telescopes into sound. This effort makes it possible to experience data from cosmic sources with a different sense: hearing.

Beginning in the center, the sonification of the Tycho supernova remnant expands outward in a circle. The image contains X-ray data from Chandra where the various colors represent small bands of frequency that are associated with different elements that are moving both toward and away from Earth. For example, red shows iron, green is silicon, and blue represents sulfur. The sonification aligns with those colors as the redder light produces the lowest notes and blue and violet create the higher-pitched notes. Color varies over the remnant, but the lowest and highest notes (red and blue) dominate near the center and are joined by other colors (mid-range notes) towards the edge of the remnant. White corresponds to the full range of frequencies of light observable by Chandra, which is strongest toward the edge of the remnant. This light is converted to sound in a more direct way as well, by interpreting frequencies of light as frequencies of sound and then shifting them lower by 50 octaves so that they fall within the human hearing range. The different proportions of iron, silicon, and sulfur across the remnant can be heard in the changing amounts of the low-, mid-, and high-frequency peaks in the sound. The field of stars in the image as observed by Hubble is played as notes on a harp with the pitch determined by their color.

Sonification Credit: NASA/CXC/SAO/K.Arcand, SYSTEM Sounds (M. Russo, A. Santaguida)

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