Scientists have only searched through a tiny fraction of our galaxy, and with the fast advances in technology, we can expect many more interesting discoveries in the future. But for now, check out the handy infographic below, courtesy of Space.com, displaying all known types of alien worlds.
Summary of the top 5 'habitable planets'. Ps. Things are advancing so fast with recent discoveries with the Kepler Probe that we now already have an even stronger candidate than these five, Kepler-186f (see next pin on this Board), inside the Goldilocks Zone for the Red Dwarf Star it orbits & just 10% more massive than Earth. Place your bets please!