Just a comment/suggestion. I think your thumbnail could really benefit from a different image. It's hard to make anything out in the current one. Maybe zoom out a little bit and show the whole planet, or get some of the fork in there. Something like that to give the prospective voter a little more to go on.
I personally click on every single entry because I don't want to miss out on any hidden gems. But I know there are probably several people that just skim over the thumbnails and only click on the ones that look slightly interesting to them.
It's something I struggle with every week too...trying to figure out what image to use for the thumbnail. Not always easy.