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A third event was detected in early 2017.  This one was 3 billion light years away.<ref>https://phys.org/news/2017-06-gravitational-insight-black-holes.html</ref>
 
A third event was detected in early 2017.  This one was 3 billion light years away.<ref>https://phys.org/news/2017-06-gravitational-insight-black-holes.html</ref>
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===Further events ===
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Since those very early announcements, further observations of gravitational waves have continued to come in.<ref>https://ligo.org</ref>  In August 2019 the first detection of the gravitational waves from the merger of a [[black hole]] and a neutron star occurred.<ref>https://ligo.org/news/index.php#O3updateAug19</ref>  This was event S190814bv, 870 million light years away, and hence actually occurred 870 million years ago.<ref>https://www.extremetech.com/extreme/296902-scientists-detect-first-ever-collision-between-black-hole-and-neutron-star</ref>
    
== The LISA project ==
 
== The LISA project ==
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