3 new planets could host life - CNN.com

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** 3 new planets could host life **

By *Elizabeth Landau*, CNN
April 21, 2013 -- Updated 1248 GMT (2048 HKT)
This diagram lines up planets recently discovered by Kepler in terms of
their sizes, compared to Earth. Kepler-22b was announced in December 2011;
the three Super-Earths were announced April 18, 2013. All of them could
potentially host life, but we do not yet know anything definitive about
their compositions or atmosphere.This diagram lines up planets recently
discovered by Kepler in terms of their sizes, compared to Earth. Kepler-22b
was announced in December 2011; the three Super-Earths were announced April
18, 2013. All of them could potentially host life, but we do not yet know
anything definitive about their compositions or atmosphere.
This illustration depicts Kepler-62e, a planet in the habitable zone of a
star smaller and cooler than the sun. It is located about 1,200 light-years
from Earth in the constellation Lyra.This illustration depicts Kepler-62e,
a planet in the habitable zone of a star smaller and cooler than the sun.
It is located about 1,200 light-years from Earth in the constellation Lyra.
This illustration depicts Kepler 62f, a planet in the habitable zone of a
star smaller and cooler than the sun


Source: www.cnn.com/2013/04/18/us/planet-discovery


is there life on other planets


Extraterrestrial life - Wikipedia, the free encyclopedia

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** Extraterrestrial life **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other uses, see Astrobiology.
The official U.S. government position on extraterrestrial life, and the
three major efforts in the search for it:
#Looking for extrasolar planets (File: /Kepler/ spacecraft)
#Listening for signals (File: Allen array)
#Discovery and exploration of of the Solar System using robotic spacecraft
(File: /Curiosity/ rover)

*Extraterrestrial life* (from the Latin words: /extra/ ["beyond", or "not
of"] and /terrestris/ ["of or belonging to Earth"]) is defined as life that
does not originate from Earth. It is often also referred to as *alien
life*, or simply *aliens* (or *space aliens*, to differentiate from other
definitions of alien or aliens). These hypothetical forms of life range
from simple bacteria-like organisms to beings far more complex than humans.

The development and testing of hypotheses on extraterrestrial life is known
as exobiology or astrobiology; the term astrobiology, however, includes the
study of life on Earth viewed in its astronomical context. Nonetheless,
scientists at the National Institutes of Health reported studies that life
in the universe may have begun "9.7±2.5 billion years ago", billions of
years before the Earth was formed, based on extrapolating the "genetic
complexity of organisms" [from "major phylogenetic lineages"] to earlier
times.^[1]^[2] Many scientists consider extraterrestrial life to be
plausible, but there is no direct evidence of its existence. Since the
mid-20th century, there has been an ongoing search for signs of
extraterrestrial life, from radios used to detect possible extraterrestrial
signals, to telescopes used to search for potentially habitable extrasolar
planets. It has also played a major role in works of science fiction.

*Contents*

· 1 Background
· 2 Possible basis

· 2.1 Biochemistry
· 2.2 Evolution and morphology


Source: en.wikipedia.org/wiki/Extraterrestrial_life

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