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There are approx 5x1022 stars in the Universe. (see a previous Wiki question)

Say only 1 in a million has a planetary system.

Say only 1 in a million of these has a planet capable of supporting life.

There are therefore approx 5x1022 / 1012 = 5x1010 'earth like' planets.

Suppose only 1 in a million of these actually evolved intelligent life.

There are at least 1010 / 106 = 10,000 intelligent races out there!!

At least one individual from one of these (apart from me) is probably sitting at their computer working out this very fact.

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As appealing as it is to imagine that there are thousands of earth-like planets, there is not yet any evidence that any exist outside of earth itself. The numbers are compelling, but they are not proof. Rather than getting caught up in the wildly exciting prospect of finding planets that harbor forms of life that we would recognize as such, it is more important right now for us to continue refining our abilities to accurately detect smaller and smaller planets that have even a chance of being earth-like.

The answer is unknown.

Scientists have been puzzling over that question for years and they still haven't found an answer.

Humans are only able to land on a few planets due to the time it takes to travel so cannot fully explore each planet.

ANOTHER ANSWER: By the way it would be very egotistical of us to think that we are the only life in the universe .... (that would be a lot of wasted space if we were!)

Check this link:

http://astromic.blogspot.com/2011/04/hunt-for-new-planets.html

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13y ago

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