AGUASONIC ACOUSTICS / SCIENCE PHOTO LIBRARY AGUASONIC ACOUSTICS / SCIENCE PHOTO LIBRARY
Black holes merging, wavelet graph. The black hole merger produced gravitational waves that were detected by the LIGO (Laser Interferometer Gravitational-Wave Observatory) gravitational wave detector laboratories in Hanford, Washington, USA, and Livingston, Louisiana, USA, on 14th September 2015. The black holes merged 1.3 billion years ago. This image was produced by converting the frequencies of the gravitational waves into a graph using a mathematical process known as wavelets. Wavelets reveal structure and detail that are not always visible in standard graphs of frequency over time (known as a spectrogram). Gravitational waves are ripples in the curvature of spacetime that travel outward from a central source. Gravitational waves were predicted by Einstein in 1916, and remained undetected for a century.
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