. "products that are leftover after a star dies" . "degenerate remnant" . "stellar remnants" . "compact" . . "degenerate remnants" . "compact stellar objects" . . . "compact star" . "compact stellar remnant" . . "compact stellar object" . . . "degenerate" . . . "compact companion" . . "compact object" . "degenerate star" . "Compact star" . "stellar remnant" . "compact objects" . "stellar core remnant" . "Stellar remnants" . "compact stellar remnants" . . . "Compact star" . "compact-object" .