This is a pretty big milestone. The first Earth sized planet in a star’s habitable zone. Pity it’s so far away (500 light years) that spectral analysis probably won’t be possible to figure out what its atmosphere has in it.
The first Earth-sized exoplanet orbiting within the habitable zone of another star has been confirmed by observations with both the W. M. Keck Observatory and the Gemini Observatory. The initial discovery, made by NASA’s Kepler Space Telescope, is one of a handful of smaller planets found by Kepler and verified using large ground-based telescopes. It also confirms that Earth-sized planets do exist in the habitable zone of other stars.