Astronomers have discovered a hefty new Super-Earth that's as dense as lead. This rocky world might just be the leftover core ...

That shakes out to a density of about 11 grams per cubic centimeter, on par with that of lead. That makes it the densest known planet in its class – ultra-short-period (USP) Super-Earths.

This rocky "super-Earth" is approximately 1.6 times the size of Earth but crams in 7.7 Earth masses, giving it a staggering density of about 11 grams per cubic centimeter—similar to lead.