Pulsars are more than just cool blinking lights shining across the universe. The discovery of the first binary pulsar paved the way for gravitational wave astronomy astronomy today.
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Sources:
https://www.nature.com/articles/217709a0
http://articles.adsabs.harvard.edu/pdf/1975ApJ…195L..51H
https://arxiv.org/pdf/1411.3930.pdf
https://astrobites.org/2018/02/02/looking-back-at-the-hulse-taylor-binary-pulsar/
https://www.aps.org/publications/apsnews/200602/history.cfm
https://www.nature.com/articles/277437a0
https://www.amnh.org/explore/videos/space/gravity-making-waves/essay-waiting-for-gravity-at-ligo
https://iopscience.iop.org/article/10.1088/0264-9381/21/5/005/meta
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.061102
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.161101
https://www.nationalgeographic.com/science/space/reference/gravitational-waves/
Images:
https://www.ligo.caltech.edu/image/ligo20160615f
https://svs.gsfc.nasa.gov/10143
https://commons.wikimedia.org/wiki/File:Russell_Alan_Hulse.jpg
https://commons.wikimedia.org/wiki/File:2008JosephTaylor.jpg
https://commons.wikimedia.org/wiki/File:Arecibo_Observatory.png
https://svs.gsfc.nasa.gov/20267
https://svs.gsfc.nasa.gov/10582
https://svs.gsfc.nasa.gov/20225
https://svs.gsfc.nasa.gov/10426
https://svs.gsfc.nasa.gov/11086
https://svs.gsfc.nasa.gov/12740
https://nasaviz.gsfc.nasa.gov/12949
https://svs.gsfc.nasa.gov/20136
https://www.ligo.caltech.edu/image/ligo20150731a
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