Yes I understand all that, but direct detection is definitely not impossible.  The PTOLEMY experiment at Princeton is attempting to do just that, although it&#x27;s very very hard.  Might still be decades away.<p><a href="http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;1307.4738" rel="nofollow">http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;1307.4738</a>