
Planets, Aliens and Fermi Paradox: Climate or Photons?
If we are alone, why? If we are not alone, where is everyone? There should be well over 11 billion planets in our galaxy with
While throughout history there have been people who realised the Earth was finite, too few have stopped to fully contemplate grok the concept. Grok that the area of the Earth is finite, that the resources of the Earth are finite, and the time the Earth will exist is finite.
It was not until the 1700s that a significant number of people in different countries could even accurately picture the planet entire planet and appreciate the surface was finite, and not until the 1900s that the term 'sustainability' attracted significant attention, and people started to appreciate how resources are finite.
This missing piece in this picture is still time, with most people still having a time horizon that allows time for our planet can be considered infinite, even though finite, and there is less than 2% of time remaining for life on Earth.
If we are alone, why? If we are not alone, where is everyone? There should be well over 11 billion planets in our galaxy with
This is an exploration of what ‘births per woman’ means, and how it is measured. Key to discussion about population is population growth, which is most commonly analysed from ‘births per woman’, which is also called ‘fertility rate’. But what is ‘births per woman’? Answer: not quite what you might expect, which means a small adjustment is required for interpreting births per woman when predicting population growth.