I don't really like the concept, but the execution is really lacking in both the logo and banner. Overall I think they are pretty dull.
Logo
- The image (planet) has no impact at all. It's too thin and boring. This is made worse by the text overlapping it.
- The type is very poor, both in font choice and kerning.
Banner
- The text again is really bad. You need to download some new fonts. Try dafont.com for lots of good free ones.
- The whole composition is just very bland and boring. Nothing draws me in.
Mostly you need to work on your text. Then try and liven up the logo; perhaps try to create a slightly more abstract representation of a planet.
Keep working at it and keep us posted on your progress.