Summary: <p>Episode: <a style="font-size: 11px;" href="http://www.uh.edu/engines/epi2537.htm">2537</a><span style="font-size: 11px;"> Vredefort, Chicxulub, Apophis — once and future threats to Earth</span></p>
Summary: <p>Episode: <a style="font-size: 11px;" href="http://www.uh.edu/engines/epi2537.htm">2537</a><span style="font-size: 11px;"> Vredefort, Chicxulub, Apophis — once and future threats to Earth</span></p>