Black holes had the spotlight as the centerpiece of the gravitational waves discovery announced recently. The waves were produced during the final fraction of a second of the merger of two black holes – that were about 29 and 36 times the mass of the sun, to produce a single, more massive spinning black hole. NASA defines black holes as places in space where gravity pulls so much that even light cannot get out. The gravity is so strong because matter has been squeezed into a tiny space and that can happen when a star is dying for example. While black holes are basically invisible, they make for some spectacular imagery, some an artist’s interpretation, in the space matter and stars around them.
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