&gt; &quot;I think it was a bad few months, really,&quot; Morgan says.<p>Actually, there&#x27;s quite a bit of evidence that the dinos were wiped out in a matter of days, if not hours.  The ejecta from the impact was launched out into space on sub-orbital trajectories.  When it fell back, it heated the atmosphere and turned the whole planet into a giant convection oven.<p><a href="http:&#x2F;&#x2F;www3.nd.edu&#x2F;~cneal&#x2F;CRN_Papers&#x2F;Schulte10_Sci_Chicxulub.pdf" rel="nofollow">http:&#x2F;&#x2F;www3.nd.edu&#x2F;~cneal&#x2F;CRN_Papers&#x2F;Schulte10_Sci_Chicxulub...</a>