Sometimes at night I stare at the starry sky and wonder in this vast and infinite universe will we really be alone? Personally, I do not think so. There must be something else out there, maybe not as we imagine a stubborn Martian with super intelligence but if there has to be more, the NASA always discovers new planets but rarely some with characteristics similar to the Earth, such as the case this time when discovering the so-called Kepler 452b is a kind of land 2.0
