Sadala is pretty far from Earth, and I don't think Earth really developed its space faring technology much yet. Saiyans have visited Earth before, but people probably didn't notice. We look like humans.

[Especially since the Saiyans of Universe 6 evolved to not have tails a long time ago.

She smiles at Misa trying to keep things positive. She appreciates the effort]

It's good. I bet they have some things from Earth, too.