Heliocodex

Learn / Ideas that run through all of it

Life

One of the ideas that runs through every place the lessons go. 4 lessons, in the order to read them.

  1. Start hereAre we alone?Life is known on one planet only. Where else might it be, how would we recognise it, and what has the search found so far?First look · How it works · The frontier
  2. What life needsLife on Earth needs liquid water, a few common elements and a supply of energy. Given those, it turns up in boiling springs and in the dark of the sea floor.First look · How it works
  3. Looking for life in the Solar SystemFour places near home might hold life or the remains of it: Mars, Europa, Enceladus and Titan. Spacecraft have been to all four, and more are on the way.First look · How it works
  4. Listening for someone elseSince 1960 radio telescopes have listened for a signal from another civilisation. Nothing confirmed has been heard. That silence is itself a puzzle.First look · How it works

Outline Still to be written here

  1. Signs of life from far awayWhat a living planet would look like to a distant telescope.