The Fermi Paradox: Too Rare? II

In my previous post, I had discussed this list up to the origin of life.

  1. Stars I
  2. Planets I
  3. Origin of Life I
  4. Origin of Photosynthesis
  5. Multicellularity
  6. Colonization of Land
  7. Intelligence
  8. Technology
  9. Abstract Science

Here, I’ll be doing up to colonization of land.

Continue reading

The Fermi Paradox: Too Rare?

In this post, I will discuss the solution that interstellar-capable extraterrestrial civilizations are rare or nonexistent. For most of that solution, we must extrapolate from our civilization, with all the risks of extrapolating from a single example. So I must work with an emergence scenario that has several steps, and at least one of them can be a bottleneck. Here are the steps that I will discuss:

  1. Stars
  2. Planets
  3. Origin of Life
  4. Origin of Photosynthesis
  5. Multicellularity
  6. Colonization of Land
  7. Intelligence
  8. Technology
  9. Abstract Science

Since this post has grown to be rather long, I will leave off at the origin of life.

Continue reading

Where are they? The Fermi Paradox

Around 1950, Italian physicist Enrico Fermi asked “Where are they?” about extraterrestrial civilizations with interstellar communications or transportation capabilities. As a result, the name “Fermi paradox” has become applied to the conundrum that there ought to be lots of such civilizations, despite our not observing any broadly-convincing evidence of them.

This conundrum has been abundantly discussed with a large number of proposed solutions. Like here:

The solutions fall into three main categories:

  1. The ET’s are rare, if not absent.
  2. The ET’s are common, but it is difficult or impossible to make contact.
  3. The ET’s are common, and they choose to hide from us and/or to not make contact with us.

In my next posts, I will explore these possibilities.