Understanding planetary habitability is partly an extrapolation of the Earth's conditions, as this is the only planet currently known to support life. Planetary habitability is the measure of a planet's or a natural satellite's potential to develop and sustain life. Life may develop directly on a planet or satellite or be transferred to it from another body, a theoretical process known as panspermia. As the existence of life beyond Earth is currently uncertain, planetary habitability is largely an extrapolation of conditions on Earth and the characteristics of the Sun and Solar System which appear favourable to life's flourishing—in particular those factors that have sustained complex, multicellular organisms and not just simpler, unicellular creatures. Research and theory in this regard is a component of planetary science and the emerging discipline of astrobiology. Planetary habitability Planetary habitability
Terraforming An artist's conception shows a terraformed Mars in four stages of development. Terraforming (literally, "Earth-shaping") of a planet, moon, or other body is the theoretical process of deliberately modifying its atmosphere, temperature, surface topography or ecology to be similar to the biosphere of Earth to make it habitable by Earth-like life. The term "terraforming" is sometimes used more generally as a synonym for planetary engineering, although some consider this more general usage an error.[citation needed] The concept of terraforming developed from both science fiction and actual science. The term was coined by Jack Williamson in a science-fiction story ("Collision Orbit") published during 1942 in Astounding Science Fiction,[1] but the concept may pre-date this work.

Terraforming

Artist's conception of the process of terraforming Mars. The terraforming of Mars is the hypothetical process by which Martian climate, surface, and known properties would be deliberately changed with the goal of making large areas of the environment more hospitable to human habitation, thus making human colonization much safer and more sustainable. The concept relies on the assumption that the environment of a planet can be altered through artificial means. In addition, the feasibility of creating a planetary biosphere on Mars is undetermined. There are several proposed methods, some of which present prohibitive economic and natural resource costs, and others that may be currently technologically achievable.[1] Terraforming of Mars Terraforming of Mars
The Mars Homestead Project - Arrive, Survive, & Thrive!™ The Mars Homestead™ Project, the main project of the Mars Foundation™, is developing a unified plan for building the first habitat on Mars by exploiting local materials. The ultimate goal of the project is to build a growing, permanent settlement beyond the Earth, thus allowing civilization to spread beyond the limits of our small planet. Support the Mars Foundation with a Donation Four Students Are Going To Mars Wednesday, August 3rd, 2011 You can help 4 students working on Mars Settlement technology and concepts, PLUS get the word out that we CAN and SHOULD settle the Red Planet. The Mars Homestead Project - Arrive, Survive, & Thrive!™
Astrobiology is the study of the origin, evolution, distribution, and future of life in the universe: extraterrestrial life and life on Earth. This interdisciplinary field encompasses the search for habitable environments in our Solar System and habitable planets outside our Solar System, the search for evidence of prebiotic chemistry, laboratory and field research into the origins and early evolution of life on Earth, and studies of the potential for life to adapt to challenges on Earth and in outer space.[2] Astrobiology addresses the question of whether life exists beyond Earth, and how humans can detect it if it does.[3] (The term exobiology is similar but more specific — it covers the search for life beyond Earth, and the effects of extraterrestrial environments on living things.)[4]

Astrobiology

Astrobiology
Predicting what extra-terrestrials will be like: and preparing for the worst 1. Introduction ‘Astrobiology is the study of things that do not exist.’ This well-known statement can be dismissed as flippant cynicism, but one might suggest that in its vernacular way it is struggling to grasp what on earth (so to speak) we might expect to find. Consider the presumed alternatives: will the extra-terrestrials be utterly familiar, completely alien (whatever that is supposed to mean) or is the search a complete waste of time? Predicting what extra-terrestrials will be like: and preparing for the worst
Exobiologie

Genomics and Cell Biology Jeff Benca is an admitted ueber-geek when it comes to prehistoric plants, so it was no surprise that, when he submitted a paper describing a new species of long-extinct lycopod for publication, he ditched the standard line drawing and insisted on a detailed and beautifully rendered color reconstruction of the plant. This piece earned the cover of March's centennial issue of the American Journal of Botany. Astrobiology Web

Astrobiology Web

COSPAR Home Page
Stellar engine Stellar engine Stellar engines are a class of hypothetical megastructures which use a star's radiation to create usable energy. Some variants use this energy to produce thrust, and thus accelerate a star, and anything orbiting it, in a given direction. The creation of such a system would make its builders a Type-II civilization on the Kardashev scale. There are three variant classes of this idea. Class A (Shkadov thruster)[edit]
Astrobiology: The Living Universe - Main Page
Kardashev scale

Kardashev scale

The Kardashev scale is a method of measuring a civilization's level of technological advancement, based on the amount of energy a civilization is able to utilize. The scale has three designated categories called Type I, II, and III. A Type I civilization uses all available resources impinging on its home planet, Type II harnesses all the energy of its star, and Type III of its galaxy. The scale is only hypothetical, but it puts energy consumption in a cosmic perspective.
Kardashev scale civilizations, type 0,1,2,3 civilizations and beyond
Michio Kaku 3 types of Civilizations
The multiverse (or meta-universe) is the hypothetical set of infinite or finite possible universes (including the historical universe we consistently experience) that together comprise everything that exists and can exist: the entirety of space, time, matter, and energy as well as the physical laws and constants that describe them. The various universes within the multiverse are sometimes called parallel universes. The structure of the multiverse, the nature of each universe within it and the relationships among the various constituent universes, depend on the specific multiverse hypothesis considered. Multiple universes have been hypothesized in cosmology, physics, astronomy, religion, philosophy, transpersonal psychology and fiction, particularly in science fiction and fantasy. Multiverse

Multiverse

Drake Vs Fermi...

Drake equation

The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy. The equation was written in 1961 by Frank Drake not for purposes of quantifying the number of civilizations,[1] but intended as a way to stimulate scientific dialogue at the world's first SETI meeting, in Green Bank, West Virginia. The equation summarizes the main concepts which scientists must contemplate when considering the question of other radio-communicative life.[1] The Drake equation has proved controversial since several of its factors are currently unknown, and estimates of their values span a very wide range. This has led critics to label the equation a guesstimate, or even meaningless.
We could spot alien civilizations from the light of their cities
Idées du nombre d'Exoplanètes découvertes | Français | English | Italiano | Polski | Le tableau ci-dessous donne: Le nom de l'étoile, suivi d'une lettre en minuscule, b, c, d,...: chaque lettre correspond à une planète orbitant autour de l'étoile.
The Possibility of Alien Life Is Now (Almost) Impossible to Deny
Happy Birthday, World Wide Web! The 25-year-old Web, along with the Internet and the personal computer, are among mankind’s greatest inventions. But back then, who knew? A techno-writer reminisces about the early days of the WWW and says he didn’t think it would ever catch on. Also, meet an inventor who claims his innovation will leave your laptop in the dust. Big Picture Science
Planetary Habitability Laboratory @ UPR Arecibo
Kepler's Exoplanets Visualized
Astronomers Have Found the First Earth-Sized, Habitable Zone Planet
Les exoplanètes
NSRC 2012
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Exoplanet Atlas full of errors – VisualJournalism
Welcome to the NASA Exoplanet Archive
Les exoplanètes de Kepler réunies
What our civilization needs is a billion-year plan
Odyssespace: l'astronomie sous toutes ses formes | Accueil
Largest-Ever Simulation of the Universe Revealed
Embryo space colonization
Self-replicating spacecraft
Living Universe Foundation
The Future
Headlines
Noogenesis
| 100 Year Starship™
Stanford torus
Dyson Spheres: The Ultimate Energy Shell Game
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