Here's a great story I found on CNN.com. The link to the story is at the bottom.
As NASA prepares to hunt for Earth-like planets in our corner of the
Milky Way galaxy, there's new buzz that "Star Trek's" vision of a
universe full of life may not be that far-fetched.
Pointy-eared aliens traveling at light speed are staying firmly in
science fiction, but scientists are offering fresh insights into the
possible existence of inhabited worlds and intelligent civilizations in
space.
There may be 100 billion Earth-like planets in the Milky
Way, or one for every sun-type star in the galaxy, said Alan Boss, an
astronomer with the Carnegie Institution and author of the new book
"The Crowded Universe: The Search for Living Planets."
He made
the prediction based on the number of "super-Earths" -- planets several
times the mass of the Earth, but smaller than gas giants like Jupiter
-- discovered so far circling stars outside the solar system.
Boss said that if any of the billions of Earth-like worlds he believes
exist in the Milky Way have liquid water, they are likely to be home to
some type of life.
"Now that's not saying that they're all going to be crawling with intelligent human beings or even dinosaurs," he said.
"But I would suspect that the great majority of them at least will have
some sort of primitive life, like bacteria or some of the multicellular
creatures that populated our Earth for the first 3 billion years of its
existence."
Putting a number on alien worlds
Other
scientists are taking another approach: an analysis that suggests there
could be hundreds, even thousands, of intelligent civilizations in the Milky Way.
Researchers at the University of Edinburgh in Scotland constructed a
computer model to create a synthetic galaxy with billions of stars and
planets. They then studied how life evolved under various conditions in
this virtual world, using a supercomputer to crunch the results.
Galaxy Quest• The Milky Way is believed to be more than 13 billion years old.
• It is just one of billions of galaxies in the universe.
• The Milky Way has a circumference of about 250,000-300,000 light years.
• It is about 100,000 light years in diameter.
• There are three types of galaxies: ellipticals, spirals and irregulars.
• The Milky Way is a large disk-shaped barred spiral galaxy. (A barred galaxy has a bar-shaped structure in its middle.)
Source: Space.com
In a paper published recently in the International Journal of
Astrobiology, the researchers concluded that based on what they saw, at
least 361 intelligent civilizations have emerged in the Milky Way since
its creation, and as many as 38,000 may have formed.
Duncan
Forgan, a doctoral candidate at the university who led the study, said
he was surprised by the hardiness of life on these other worlds.
"The computer model takes into account what we refer to as resetting or
extinction events. The classic example is the asteroid impact that may
have wiped out the dinosaurs," Forgan said.
"I half-expected these events to disallow the rise of intelligence, and yet civilizations seemed to flourish."
Forgan readily admits the results are an educated guess at best, since
there are still many unanswered questions about how life formed on
Earth and only limited information about the 330 "exoplanets" -- those
circling sun-like stars outside the solar system -- discovered so far.
The first was confirmed in 1995 and the latest just this month when
Europe's COROT space telescope spotted the smallest terrestrial
exoplanet ever found. With a diameter less than twice the size of
Earth, the planet orbits very close to its star and has temperatures up
to 1,500° Celsius (more than 2,700° Fahrenheit), according to the European Space Agency. It may be rocky and covered in lava.
Hunt for habitable planets
NASA
is hoping to find much more habitable worlds with the help of the
upcoming Kepler mission. The spacecraft, set to be launched from Cape
Canaveral Air Force Station in Florida next week, will search for
Earth-size planets in our part of the galaxy.
Kepler contains a special telescope that will study 100,000 stars in
the Cygnus-Lyra region of the Milky Way for more than three years. It
will look for small dips in a star's brightness, which can mean an
orbiting planet is passing in front it -- an event called a transit.
"It's akin to measuring a flea as it creeps across the headlight of an
automobile at night," said Kepler project manager James Fanson during a
during a NASA news conference.
The focus of the mission is
finding planets in a star's habitable zone, an orbit that would ensure
temperatures in which life could exist. Boss, who serves on the Kepler Science Council, said scientists should
know by 2013 -- the end of Kepler's mission -- whether life in the
universe could be widespread.
Finding intelligent life is a very
different matter. For all the speculation about the possibility of
other civilizations in the universe, the question remains: If the rise
of life on Earth isn't unique and aliens are common, why haven't they
shown up or contacted us? The contradiction was famously summed up by
the physicist Enrico Fermi in 1950 in what became known as the Fermi
paradox: "Where is everybody?"
The answer may be the vastness of time and space, scientists explained.
"Civilizations come and go," Boss said. "Chances are, if you do happen
to find a planet which is going to have intelligent life, it's not
going to be in [the same] phase of us. It may have formed a billion
years ago, or maybe it's not going to form for another billion years."
Even if intelligent civilizations did exist at the same time, they
probably would be be separated by tens of thousands of light years,
Forgan said. If aliens have just switched on their transmitter to
communicate, it could take us hundreds of centuries to receive their
message, he added.
As for interstellar travel, the huge distances virtually rule out any extraterrestrial visitors. To illustrate, Boss said the fastest
rockets available to us right now are those being used in NASA's New
Horizons mission to Pluto. Even going at that rate of speed, it would
take 100,000 years to get from Earth to the closest star outside the
solar system, he added.
"So when you think about that, maybe we shouldn't be worried about having interstellar air raids any time soon," Boss said.
http://www.cnn.com/2009/TECH/space/02/25/galaxy.planets.kepler/index.html
Galaxy May Be "Full of Earths", Alien Life
Re: Galaxy May Be "Full of Earths", Alien Life
