Or a smaller rock moving really fast. "The Killing Star" describes it well, here is an excerpt: http://www.projectrho.com/rocket/spacegunexotic.php#id--Relativ

Or a smaller rock moving really fast. "The Killing Star" describes it well, here is an excerpt: http://www.projectrho.com/rocket/spacegunexotic.php#id--Relativistic_Weapons--The_Killing_Star http://www.projectrho.com/rocket/spacegunexotic.php#id--Rela...