The densest elements on the periodic table are not at the heavy end. In fact, a cubic foot of osmium would make the world's best paper rate. Gold is very dense as well, much denser than lead. So you don't have that much of these rare elements to try to create so much of it.
The pull of gravity (the force, not the movie) is irresistible as Neil deGrasse Tyson and Leighann Lord grapple with weighty fan questions about matter and the curvature of spacetime.
Read more and listen to the full episode at http://www.startalkradio.net/show/cosmic-queries-gravity/
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