Compact Ultra Dense Matter Impactors
  We study interactions of meteorlike compact ultradense objects (CUDO), having nuclear or greater density, with Earth and other rocky bodies in the Solar System as a possible source of information about novel forms of matter. We study the energy loss in CUDO puncture of the body and discuss differences between regular matter and CUDO impacts. 
Johann Rafelski, Lance Labun, and Jeremiah Birrell
astro-ph.EP hep-ph physics.geo-ph