It&#x27;s been done to an extent - a flashed message in the CMB appeared in Three Body Problem, here&#x27;s the excerpt <a href="http:&#x2F;&#x2F;www.tor.com&#x2F;2014&#x2F;09&#x2F;23&#x2F;the-three-body-problem-the-universe-flickers&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.tor.com&#x2F;2014&#x2F;09&#x2F;23&#x2F;the-three-body-problem-the-uni...</a>