Rare Earth; compared to others (Introduction)

by David Turell , Thursday, September 17, 2015, 14:08 (3356 days ago) @ David Turell

So far none of the planets in the habitable zone look like the Earth:-https://www.newscientist.com/article/dn28170-earths-composition-might-be-unusual-for-a-planet-with-life/-"Is Earth the odd planet out? Many of our galaxy's habitable planets probably have a chemical composition that is quite different from Earth's.-"Vardan Adibekyan of the Institute of Astrophysics and Space Sciences, Portugal, and colleagues looked at stars with a similar mass and radius to the sun that are known to have planets in their habitable zones, where water stays liquid. They found that these stars tended to have less iron and other metals than stars that host only inhospitable worlds."