center-to-center distance of 6,900 to 46,300 km involves which orbital period?
CREATE TABLE "escape_velocities_at_altitude" (
  "orbit" text,
  "center_to_center_distance" text,
  "altitude_above_the_earth_s_surface" text,
  "orbital_period" text,
  "specific_orbital_energy" text
);
SELECT "orbital_period" FROM "escape_velocities_at_altitude" WHERE "center_to_center_distance"='6,900 to 46,300 km';