[troutman]

More on exoplanet K2-18b (it is really not much like Earth at all):

https://en.wikipedia.org/wiki/K2-18b

The planet, initially discovered through the Kepler Space Observatory, is about eight times the mass of Earth, thus is classified as a super Earth. It has a 33-day orbit within the star's habitable zone, but it is unlikely to be habitable.

This lies within the constellation of Leo, but outside its lion asterism.[10] When first discovered, K2-18's distance from Earth was estimated to be 110 light-years (34 pc).[8] However, more precise data from the Gaia star mapping project has shown K2-18 to be at a distance of 124.02 ± 0.26 light-years (38.025 ± 0.079 pc).

While it was initially considered a mini-Neptune on its 2015 discovery,[8] the improved data on K2-18b has classified it as a super-Earth,[9] although its size and density make it unlikely to be composed of rocky iron and silicates; it is more likely to be composed of hydrogen, helium, and astronomical ices.[12] A comparison of K2-18b's size, orbit, and other features to other detected exoplanets suggests that the planet could support an atmosphere that contains additional gasses besides hydrogen and helium.