As for verified life there currently is only 1 - Earth. Currently efforts to find other life-supporting planets is contained to first finding life-supporting stars, as they are more so the key. If the life giving source isn't adequate, such as a star that emits too much radiation, then any planets orbiting will be unable to support life no matter their size, or location.
We only know of one world with life and that is earth. So any other statement would have to be guesswork. Take a look at the Drake equation for a qualified guess.
It states how many civilizations there might be out there by looking at things like starformation. Most of the factors are guesses however. How many stars have planets? The sun has 8 and we have found planets around hundreds of stars. One third of all stars are part of a multiple stars system so we can atleast coun them out has likely to have planets. A star would have to have a long enough lifetime to harbor life so we can count out the massive stars. And really small stars would put their planets so close to it, to be warm enough for life, that they would be in a synchronous orbit. And small stars could generate CMEs that would make the suns look like a mere sneeze. So let´s disqualify the smaller stars too. That leaves us with "only" 40 billion stars in the Milky way alone that could harbour life if a planet was formed at the right distance. So unless the odds of life forming are 40 billion to 1 there could be quite alot of life ou there.
None are be attentive to yet with this sort of great form of massive call there's a intense threat there are hundred if no longer thousands of planet with various ranges of existence on them. Planets that would purely have micro organism, planets with more desirable existence varieties some more desirable previous us.
when u think that our tiny blue pearl floats in the never ending ever expanding blackness that creeps all around us called SPACE which contains billions of other suns like our own ( we call em night stars ) in are our home galaxy alone! called the milky way NOT TO MENTION THE BILLIONS OF OTHER GALAXIES.....id say 364 more life sustaining planets other than our MIRACLE PLANET inthe home galaxy
This is still up for grabs, as it is not known at this time and may never be known. The distances are so great, investigating other planets and solar systems take millions of years. I really don't expect to be around then. :-)
We know of exactly one. Earth. There may be others, but we don't know about any of them. So any number would be just a guess, and your guess is as good as mine.
Answers & Comments
Verified answer
One known and a couple probables. Signs of water have been found on some planets and moons that may have life now or had it in the past.
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As for verified life there currently is only 1 - Earth. Currently efforts to find other life-supporting planets is contained to first finding life-supporting stars, as they are more so the key. If the life giving source isn't adequate, such as a star that emits too much radiation, then any planets orbiting will be unable to support life no matter their size, or location.
A good set of articles, written from a scientific point of view, are available through Wikipedia at the following location: http://en.wikipedia.org/wiki/Extraterrestrial_life...
We only know of one world with life and that is earth. So any other statement would have to be guesswork. Take a look at the Drake equation for a qualified guess.
http://en.wikipedia.org/wiki/Drake_equation
It states how many civilizations there might be out there by looking at things like starformation. Most of the factors are guesses however. How many stars have planets? The sun has 8 and we have found planets around hundreds of stars. One third of all stars are part of a multiple stars system so we can atleast coun them out has likely to have planets. A star would have to have a long enough lifetime to harbor life so we can count out the massive stars. And really small stars would put their planets so close to it, to be warm enough for life, that they would be in a synchronous orbit. And small stars could generate CMEs that would make the suns look like a mere sneeze. So let´s disqualify the smaller stars too. That leaves us with "only" 40 billion stars in the Milky way alone that could harbour life if a planet was formed at the right distance. So unless the odds of life forming are 40 billion to 1 there could be quite alot of life ou there.
None are be attentive to yet with this sort of great form of massive call there's a intense threat there are hundred if no longer thousands of planet with various ranges of existence on them. Planets that would purely have micro organism, planets with more desirable existence varieties some more desirable previous us.
Well, thank god I don't have to be exact, but I am going to be exact anyway.
After millions of years of research by trillions upon trillions of people, we have observed exactly ONE planet in our galaxy with life.
Anyone that can prove me wrong would already be famous by now...
when u think that our tiny blue pearl floats in the never ending ever expanding blackness that creeps all around us called SPACE which contains billions of other suns like our own ( we call em night stars ) in are our home galaxy alone! called the milky way NOT TO MENTION THE BILLIONS OF OTHER GALAXIES.....id say 364 more life sustaining planets other than our MIRACLE PLANET inthe home galaxy
This is still up for grabs, as it is not known at this time and may never be known. The distances are so great, investigating other planets and solar systems take millions of years. I really don't expect to be around then. :-)
We know of exactly one. Earth. There may be others, but we don't know about any of them. So any number would be just a guess, and your guess is as good as mine.
Carl Sagan devoted a whole episode of 'Cosmos' to that subject. Too long to retell here. ;-)