One day on Planet Vegeta, Frieza made an attempt to destroy it, as you know that the only remaining saiyans that remain are Goku, and Vegeta. But thats what they told you, that day when Frieza destroyed Planet Vegeta, The circle girls (Orb, Sphere, and Globe) were hanging out in their space pods and sooner or later saw the Supernova and started the space pods and flew off into the stars. They continued to chat in their pods but the Planet Scanner beeped twice, that means there is a planet ahead. So, they looked ahead and they saw Earth! Sooner or later after the battles were over, (after GT) which means from that Saiyan race is still in them.