The crucial compounds could have been brought to Earth by comets or asteroids.
A 3D map of the planet shows the ancient configurations of the oceans and continents, and how they have changed over time.
The planets could have similar light and temperature conditions to those that may have existed when life first emerged on Earth.
The Gaia hypothesis proposes that life, through its interactions with the Earth's crust, oceans, and atmosphere, produced a stabilising effect which has enabled it to survive under conditions which would have wiped it out on non-regulating planets.
Cataloguing the genetic data of 1.5 million known species will take 10 years, cost approximately $4.7 billion and require the cooperation of scientists, governments and students from around the world.
The same protein known for destroying the brains of Alzheimer's patients may have been the precursor for life on Earth.
The (likely) oldest form of life on Earth was recently found thriving in Tasmania, giving us a true glimpse of our planet 3.7 billion years ago.
Molecules that might drive the production of complex organic compounds were discovered on Titan, potentially shedding light on how life on Earth got started.
From space stations to "frozen zoos" storing embryos, eggs, sperm and the DNA of endangered animals—the movement to create our backup ready for humanity version 2.0 has already begun.