It's about time boffins took this idea seriously. Assuming extraterrestrial life exists, and developed independently (as opposed to the far-fetched 'mysteriously seeded from outer space' theory), there's no reason it needs to be remotely similar to life as we know it. Many years ago, Isaac Asimov hypothesized on the various liquid media life could potentially exist in. Depending on temperature range, these include water, ammonia, hydrocarbons, and silanes (like hydrocarbons, but replacing carbon with silicon). Ammonia-based life might function somewhat like ours, but the others would have a truly alien biology, unlike anything we've ever seen.