Therefore, a further refinement might be to combine the BCI with a second metric that takes into account how similar a planet is compared to Earth. (newatlas.com)
Finding a roughly Earth - sized world in the habitable zone next door means those other small suns might harbor similar planets. (discovermagazine.com)
The only truly Earth - like planet we know of — ours — takes more than 150 times as long as HAT - P - 7 b does to circle its star, so collecting data on similar planets across multiple orbits will take years. (scientificamerican.com)