It is estimated that there are 100 billion billion Earth-like planets
The Milky Way alone has between 200 and 400 billion stars, and there are probably an equal number of galaxies in the observable universe. This means that there would be between 10 22 and 10 24 stars in the observable universe. Also, according to the most conservative estimates, 5% of the stars would be Sun-like, implying that they could have a planetary system orbiting around them and a planet that resembles the Earth. Going again with the most conservative estimates, 20% of these stars would have a planet that is similar to the Earth in terms of temperature and composition, thus planets that could support life. In our galaxy, there would be about 10 billion Earth-like planets. In total, the observable universe would contain 100 billion billion Earth-like planets.
Source : Grand filtre (french), Wikipedia
Mariners had painstakingly mapped the coastlines of the continents. Geographers had translated these findings into charts and globes. Photographs of ...
It's the idea that people living close to nature tend to be noble. It's seeing all those sunsets that does it. You can't watch a sunset and then go off and set fire to your neighbor's tepee. Living close to nature is wonderful for your mental health.
But we can easily extend this hypothesis [that nature has beneficial effects on the physical, cognitive and emotional well-being of individuals] to the conservation of biodiversity. [Ecologists] refer to the extinction of the experience of nature, which they have mainly applied in urban areas. The idea is as follows: from generation to generation, young people live less and less in contact with nature (because there are fewer of them and because their lifestyles limit such contact), at the very moment they are building their identity. The part of their identity that integrates their intimate relationships with their natural environment would therefore diminish from generation to generation. Not because of a lack of education, but mainly because of a decline in opportunities and desires to experience nature without constraint, freely and in their own personal way.
The consequences of this decrease appear in adulthood: with a weaker environmental identity, they are less in demand for nature in their daily lives, they integrate it less in their actions. (...) But if we do not collectively take biodiversity into consideration in our lifestyles, then we will suffer.
Source : Mobilizing against the extinction of nature experience (french), july 2015, Espaces naturels
An inefficient virus kills its host. A clever virus stays with it.