Planet consists mostly of planets the size of Neptune and smaller, down to smaller than Mercury. There are types of planets that do not exist in the Solar System: super-Earths and mini-Neptunes, which could be rocky like Earth or a mixture of volatiles and gas like Neptune—a radius of 1.75 times that of Earth is a possible dividing line between the two types of planet. There are hot Jupiters that orbit very close to their star and may evaporate to become chthonian planets, which are the leftover cores. Another possible type of planet is carbon planets, which form in systems with
Sustain Our Planet Sustain Our Planet Sustain Our Planet is a consulting firm that provides carbon calculation and carbon offset consulting to individuals, schools and businesses, focusing on education and greenhouse gas emissions reduction. Sustain Our Planet was formed in 2007 to provide carbon calculation and offset consulting. The company’s carbon calculator allows individuals and businesses to identify their carbon footprint, track it over time and offset it to become carbon neutral. In 2008, Sustain Our Planet expanded its product portfolio and formed its green consulting division to provide environmental services to businesses, energy providers, schools, and cities. The consulting division specializes in