By Kip Hansen – Re-Blogged From WUWT
There has been a lot of news recently about exoplanets. An extrasolar planet is a planet outside our solar system. The Wiki article has a list of exoplanets. I only mention exoplanets because there is a set of criteria for specifications of what could turn out to be an “Earth-like planet”, of interest to space scientists, I suppose, as they might harbor “life-as-we-know-it” and/or be a potential colonization target.
One of those specifications for an Earth-like planet is an appropriate average surface temperature, usually said to be 15 °C. In fact, our planet, Sol 3 or simply Earth, is very close to qualifying as Earth-like as far as surface temperature goes. Here’s that featured image full-sized: