The past 12 months has seen a dramatic influx in announcements proclaiming the discovery of Earth-like planets. It was only a few years ago that the detection of any kind exoplanet was cause for celebration, but these days news of a potentially habitable planet has become routine. But as astronomer and astrobiologist Caleb Scharf now notes, we need to relax and take a deep breath; just because these rocky exoplanets reside within a solar system's habitable zone doesn't mean they're anything like Earth.