I need somebody to recomend me a good space series or just sci fi
my top 5 are

1.Supernatural (great show and actors)
1.Farsape (posibly the coolest)
2.stargate atlantis
3.stargate universe
4.galactica (over dramatic)
5.Deep space nine

Try Terra Nova. It's not about cosmos but it's sci-fi.
Basically it's about future on planet Earth. It has become so polluted that people can't live there anymore so a group of people travel in past at time when dinosaurs roamed the Earth to start human race there anew.

I was just in anime request topic. I know a cool Sci-fi anime. It is called The Irresponsible Captain Tylor. good stuff.

ill try terra nova
i need more suggestions

Try Fringe.
About science and more exactly medicine you can try House, It has 8 seasons and soon will end completely.
Bones the TV series isn't Sci-Phi but it has a lot of funny situations as the spin-off series called The Finder.
And if you want something similar to Supernatural then try Charmed (already finished airing) and Secret Circle.
Note: All additional info can be find on wiki or wikia,

supernatural isnt sci-fi but i reccomend it anyway its pretty cool...