Where do we go from here?
Direct imaging of exoplanets is perhaps the newest field in all of astronomy. Ten years ago it didn't exist, and was something of a dream. Now we have images of seven tiny dots, seven blips of light indicating the presence of mighty planets.
And with the advent of spectroscopy, we'll learn even more: how hot they are, and what they have in their atmospheres. Eventually, with new technology, new telescopes on space, we'll be able to split their light ever finer, and who knows? Maybe, one day not too long from now, we'll see the tell-tale sign of molecular oxygen... the only way we know of to have molecular oxygen in an atmosphere over long periods of time is through biological activity. If we ever see it... that, my friends, will be quite a day indeed.
I think that is ultimately our goal. We're looking for planets now, but what we're really looking for is life, or at least planets capable of supporting it. That day may be a long way off, but in my opinion it's a day that will, eventually, come.
Artwork of HR 8799 b credit: NASA, ESA, and G. Bacon (STScI). Larger versions available on the NASA Images website.