“We have found more than 4000 planets orbiting distant stars, but it turns out that probably none of them have the right conditions for life to evolve, making Earth even more special than we thought.”
“We normally consider a planet capable of hosting life if its surface is the right temperature for liquid water. This depends on how close it orbits its star – too far and any water will freeze, but too close and it will boil.”
One think that most near Earth investors do not find, is a lack of phoshorus (P), that is one of our planet’s general chemical elements. Without it we would not have RNA, DNA and even even not ATP, and thus we would not have life.
It is also a problem of seekers of extraterrestrial life.
Crane, Leah, 2019. We’ve found 4000 exoplanets but almost zero are right for life. New Scientist (22 March).