It's amazing to think in just a few short years we've discovered over 300 planets outside of this solar system, it's only a matter of time until we come across Earth-like which are known as "Class M Planets" to us Star Trek fanboys:
Trio of super-Earths found around Milky Way star
"European researchers said on Monday they discovered a batch of three "super-Earths" orbiting a nearby star, and two other solar systems with small planets as well. They said their findings, presented at a conference in France, suggest that Earth-like planets may be very common."