CREATE TABLE table_37869 ("orbit" TEXT, "center-to-center distance" TEXT, "altitude above the Earth's surface" TEXT, "Orbital period" TEXT, "specific orbital energy" TEXT)

center-to-center distance of 6,900 to 46,300 km involves which orbital period?
SELECT "Orbital period" FROM table_37869 WHERE "center-to-center distance" = '6,900 to 46,300 km'
SELECT "Orbital period" FROM "table_37869" WHERE "center-to-center distance" = '6,900 to 46,300 km'