By 23rd century, as an after-effect from the population boom in late 22nd, mankind begin mass-migrating onto stars, colonizing all our old Solar System & move far beyond. The Big Nine, 9 superstates that ruled the Earth from late 21st century, transfer the system into space, thus create an Interstellar Star Empire-liked System that last until mid-26th century, when the First Interstellar Conflict start with other races.