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Volume rendering of the gravitational radiation generated during the merger of a binary black hole system. The red spheres represent the horizons of the black holes. The color map shows positive wave amplitudes in yellow/red and negative amplitudes…

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from article Gravitational radiation

Effect of a gravitational wave, passing in a direction perpendicular to the plane of the paper, on a ring of test particles. The ring is distorted into an ellipse, elongated in one direction in one half-cycle of the wave, and elongated in the…

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from article Gravitational radiation

Orbital decay of the binary pulsar PSR 1913+16, discovered by Russell Hulse and Joseph Taylor in 1974. Data points show the measured change in the orbit (the periastron is the minimum separation of the pulsar from the center of mass of the binary…

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from article Gravitational radiation

The gravitational-wave signal GW150914, recorded by the LIGO detectors at Hanford, Washington, and Livingston, Louisiana, on September 14, 2015. The thick orange and blue lines show the data from the Hanford and Livingston detectors, respectively,…

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from article Ecological succession

A plant succession involves a predictable set of vegetative changes through a series of successional stages. (U.S. Environmental Protection Agency)

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from article Ecological succession

A spruce tree growing among a stand of cottonwoods. Spruce trees may eventually become the dominant species in this ecosystem. (U.S. National Park Service/Kay White)

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from article Schizophrenia risk genes

Genomic distribution of schizophrenia-associated variants. Represented by red dots, these variants signpost the genomic neighborhoods of schizophrenia risk genes on the 24 human chromosomes. Clusters of association signals (“hot spots”) are visible.…

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from article Andreaeopsida