"Atomic Rockets" has a section about "Dark Matter Planets" on their "Weird Astronomy" page. Those planets could even be heated to temperatures where liquid wate

"Atomic Rockets" has a section about "Dark Matter Planets" on their "Weird Astronomy" page. Those planets could even be heated to temperatures where liquid water can exist by exotic particles - If they are close enough to the galactic center... http://www.projectrho.com/public_html/rocket/weirdastronomy.php http://www.projectrho.com/public_html/rocket/weirdastronomy....