Given the right place and the right time, any logo would sell, it just might not be for lots of money.
IMO, the logos could sell.
Some suggestions for making the first logo better:[list=1][*]Make the blue orbiting ball go behind the darker oval.[*]Vary some colors so the blue ball doesn't look out of place.[*]Make the ovals true orbits like an atom design so that the balls follow an orbit and not just the perimeter. (May be really difficult)[/list=1]
The second logo does look good. The rest show that you're practicing and you never know when a design that is considered great will turn up!