Life - The possibility of extraterrestrial life

Life is a multi-faceted concept that may refer to the ongoing process of which living things are a part the period between the conception (the point at which the entity can be considered to be an individualized being) and death of an organism the condition of an entity between conception and death that which makes a living thing alive. Life - Defining the concept of life. Life - A conventional definition. In biology, a ...

Including:

• Life - Defining the concept of life
• Life - A conventional definition
• Life - Exceptions to the conventional definition
• Life - Other definitions
• Life - Descent with modification: a useful characteristic
• Life - Origin of life
• Life - The possibility of extraterrestrial life

Read more here: » Life: Encyclopedia - Life

Main articles: Extraterrestrial life, Astrobiology At this time, Earth is the only planet in the universe known by humans to support life. The question of whether life exists elsewhere in the universe remains open, but analyses such as the Drake equation have been used to estimate the probability of such life existing. There have been a number of claims of the discovery of life elsewhere in the u ...

See also:

Life, Life - Defining the concept of life, Life - A conventional definition, Life - Exceptions to the conventional definition, Life - Other definitions, Life - Descent with modification: a useful characteristic, Life - Origin of life, Life - The possibility of extraterrestrial life

Read more here: » Life: Encyclopedia II - Life - The possibility of extraterrestrial life

Life - A conventional definition. In biology, a life form has traditionally been considered to be a member of a population whose members can exhibit all the following phenomena at least once during their existence: Growth, full development, maturity Metabolism, consuming, transforming and storing energy/mass; growing by absorbing and reorganizing mass; excreting waste Motion, either moving itself, or having internal motion Reproduction, the ability of individuals to create ...

See also:

Life, Life - Defining the concept of life, Life - A conventional definition, Life - Exceptions to the conventional definition, Life - Other definitions, Life - Descent with modification: a useful characteristic, Life - Origin of life, Life - The possibility of extraterrestrial life

Read more here: » Life: Encyclopedia II - Life - Defining the concept of life

Main article: Origin of life There is no truly "standard" model of the origin of life, but most currently accepted scientific models build in one way or another on the following discoveries, which are listed roughly in order of postulated emergence: Plausible pre-biotic conditions result in the creation of the basic small molecules of life. This was demonstrated in the Urey-Miller experiment. Phospholipids spontaneously form lipid bilayers, the basic structure of a cell membrane. Procedures for producing random RNA molecules can produce ribozymes, which are able to produce more of themselves ...

See also:

Life, Life - Defining the concept of life, Life - A conventional definition, Life - Exceptions to the conventional definition, Life - Other definitions, Life - Descent with modification: a useful characteristic, Life - Origin of life, Life - The possibility of extraterrestrial life

Read more here: » Life: Encyclopedia II - Life - Origin of life