http://reasons.org/explore/blogs/todays-new-reason-to-believe/read/tnrtb/2016/05/02/thank-god-for-merging-neutron-starsOne of these exceedingly rare events was just recently witnessed for the first time:http://www.npr.org/sections/thetwo-way/2017/10/16/557557544/astronomers-strike-gravitational-gold-in-colliding-neutron-stars
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