Everybody asks that question, but no one has found a convincing answer.

unknown at the moment but if you consider the vast amount of time our planet took to reach present day conditions,millions of years in the future there maybe lots of earth like planets and evolution of humans elsewhere our dna may be universal.

OF COURSE---ME AND TOM CRUISE LIVE ON ONE....SO DOES JOHN TRAVOLTA---WHEN HE GETS HIS JET OFF THE GROUND...

Yes

I would expect so. Earth is a small part of the universe and I find it unreasonable to rule out other planets out there being habitable for humanity. The same conditions, or very similar conditions likely exist elsewhere. If you're asking if there is other life out there I would answer the same way... probably.

So far no -- there's nowhere with anything relative to living temperatures; you only have the extremes. TOO HOT, or TOO COLD. Thousands of degree differences we're talking about here. Plus, there's no oxygen due to no gymno & angiosperms, so no producers. In the future, i'm definitely for populating other planets we can make into livable enviroments -- probably not in this century however, but it will happen one day. If they already grow food out in space, what's to stop plants that will produce oxygen?

We are living in an exciting time. NASA is currently planning orbital missions to search for Earth-like planets. We may soon have an affirmative answer to the question. On another note, a planet need not be Earth-like to be habitable. There may be other forms of life (we may someday even create some) that can flourish just about anywhere in space or on an otherwise hostile planet.

im sure there are, considering how many millions of other galaxies there are. there's got to be atleast 100 out there that are okay for us:)

Statistical probability would indicate there are many.

We have been able to find similar planets... We are only a few years away from finding a home away from home...

This question cannot be so simply answered for there are many variables that are needed to actually answer this question. On one other hand, you have planets that we could simply build a protective facility to live in which in time, will be every planet, asteroid, or space where it can be built. On the other hand, you have planets that are ready for just a simple landing that have already been shaped and grown by nature. These planets have underwent namely every step in their development (perhaps other than intellegent life)that Earth has. These variables are listed as follows: The largest margin lies with the solar systems position relative to the galaxy; not to close to the core where clutter and stong forces occur, however not too far where nutron stars and gamma ray bursts lie. We are considered to be within the goldylock or habbitable zones of BOTH the solar system and the galaxy. Which brings us to this variable, that a habitable planet must be terrestrial, water bearing (liqid state),and have an atmosphere of oxygen and carbon dioxide within a solar habbitable zone (that flutuates with the type of star and it's stage in developement). Once in development of this planet, it must not be less than 1/3 and no greater than 10X Earth's mass or the planet will have no plate-techtonics to regulate temprature and recycle nutrients as well as metal surfacing, or no atmosphere to hold on to. The orbit must be more circular to the star or it may come to close or too far from it and kill the planets life. Ozone is required to protect organisums from the harmful rays of that star as well as magnetic poles to divert the solar winds and flares. Also, a large gas giant is a good idea to have between you and a horde of asteroids headed to pound your planet because it's strong gravitational pull attracts many of the undesireable asteroids (such as the ones that took out the dinosaurs or exploded over siberia in 1991). However, if you have a hot Jupiter (that is, a gas giant that is close to it's sun) that likes to get even closer to it's star, it may pass by the small terrestrial planet and fling it off orbit into the void of deep space ultamently cutting off energy to the planet allowing it to die. Micro organisums maybe needed as well to do the simple breaking down of organic materials causing them to thrive boosting the native life there. Venus and Mars are examples of failed life bearing planets because Venus is too close to the sun and Mars is too small and far from the sun. Some variables may have been over looked so keep me posted. In any other case feel free to make a comment on how extremely long my explanation is or how exact and elaborate it is. Your choice. By the way, I plan on posting a writing on the meaning of life... look for me.

3-10-2017 Nobody knows, but there are always a few people who pretend to know. They cite chances and probabilities and conclude that there is 100% chance of life. They forget that life is not a chance event. If you see one example you know there is at least one example. If you don't see one, you don't know anything. But they think they can get around that by being clever.

'On 4 November 2013, astronomers reported, based on Kepler space mission data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of Sun-like stars and red dwarfs within the Milky Way. 11 billion of these estimated planets may be orbiting Sun-like stars. [...] While most investigations of extraterrestrial life start with the assumption that advanced life-forms must have similar requirements for life as on Earth, the hypothesis of other types of biochemistry suggests the possibility of lifeforms evolving around a different metabolic mechanism. In Evolving the Alien, biologist Jack Cohen and mathematician Ian Stewart argue astrobiology, based on the Rare Earth hypothesis, is restrictive and unimaginative. They suggest that Earth-like planets may be very rare, but non-carbon-based complex life could possibly emerge in other environments.' Source: https://en.wikipedia.org/wiki/Planetary_habitability