Bullet Cluster

The Bullet Cluster (1E 0657-56) provided the first direct evidence of dark matter, the elusive substance that constitutes most of the matter in the Universe. This sonification converts data from this cluster into sound, offering an auditory representation of the merging galaxy clusters and the presence of dark matter. X-rays from Chandra, depicted in pink, reveal the hot gas that has been displaced during the merger. Dark matter, identified through gravitational lensing and shown in blue, is represented by the lowest frequencies.

In this sonification, data are panned from left to right, with each layer of data allocated to specific frequency ranges. Dark matter corresponds to the lowest frequencies, X-rays are mapped to the highest frequencies, and galaxies revealed by Hubble data occupy the mid-range frequencies. Within each layer, the pitch increases from the bottom to the top of the image, so that objects towards the top produce higher tones. This approach helps to illustrate the spatial distribution and dynamic processes within the Bullet Cluster.

Sonification credits: SYSTEM Sounds (M. Russo, A. Santaguida)