Organics found on dwarf planet Ceres

> aliphatic organic molecules

This means hydrocarbons that lack highly stable cyclical structures (e.g. benzene rings). Examples include alkanes, alkenes, alkynes like propane, ethylene, propylene, cyclohexane, etc.

We don't know what else life looks like, so we can't really look for it.

Please don't spread misinformation on things you know nothing about. This is a very well studied field, where people are making very reasonable attempts at correcting for Earth biases. For more information I suggest reading information available at websites such as this:

http://astrobiology.nasa.gov/

I tend to agree and think its a bit unfair to downvote this. Why must life exist with organics molecules?

Who would have expected arsenic based life (I don'think many would call this organic): http://www.washingtonpost.com/wp-dyn/content/article/2010/12...