billion of stars in the whole universe includes the sun. what are the chances that theres another planet earth

Answer 1

By "another earth" you mean another planet resembling the Earth and having intelligent life? Pretty good I'd say giving the vastness of the Universe. Our Galaxy only contains already 100 billion stars.

You can read up about the current estimates here:
http://en.wikipedia.org/wiki/Drake_equation

Answer 2

In our universe I would bet zero. Why would there be another Earth? There is unlimited variety in our universe; slightly different conditions everywhere leading to an unlimited variety of different outcomes (many different stars all with different planets). Even identical human twins are not truly "identical”.... absolutely the same in every detail ... why or how could there be another Earth? I believe the evidence, so far, is that our planet Earth is unique in the entire universe. Now, that does not rule out the possibility of some stars being very similar to our Sun with a planet very much like our Earth, but not actually "OUR" Earth ... maybe a kissing cousin but not a doppelganger!

Now, if there are parallel or multiple universes as hypothesized in some theories of quantum physics and cosmology then maybe yes. However, all these multi- and parallel universe theories are pure speculation at this point without one shred of verifiable evidence.

P.S. Now if you mean the possibility of intelligent life on other worlds I would guess some probability much higher than zero. I don't know what that probability is but I definitely think it is positive. Why? Well, the physics and chemistry everywhere astronomers have looked so far in the universe appears to be the same as it is on Earth. Life on Earth has almost been destroyed over a half dozen times in the past but keeps coming back like crab grass. On one occasion 90% of all life on Earth was eliminated but after a few millions of years it came back stronger then ever. I think life is a natural consequence of an evolving universe and if the conditions are right life will emerge, grow and evolve. The building blocks of life are not all that rare in the Universe. There is lots of water, oxygen, carbon and hydrogen, plus all the other necessary trace elements, all the necessary building blocks of life. Given the right conditions ... a G type star with a rocky planet, with the necessary chemical building blocks orbiting in the "habitable zone" (not to far from the star and not too close) and about 5 billion years of time to evolve on the plant, I think that the chances of intelligent life are pretty damn good.

Answer 3

There's only one Planet Earth; no two ways around that.

If you mean extraterrestrial life, then that's different.

I don't know where Viper with Venom is getting his stats. The Milky Way alone is made up of hundreds of billions of stars, there are at least that many galaxies in the universe, and other life has had billions of years to evolve.

Yes, the chances of life arising are exceedingly small, but the universe is exceedingly big. Take something like a chance of 0.000000001% against 200,000,000,000 and there's the possibility that life has evolved on hundreds of locales in our galaxy alone.

Answer 4

There are more than a billion, but most people do not have a feel for how much a billion is. In less than a billion minutes ago, Jesus walked the earth!

Nature has not created just one of anything! And that includes planets.

Answer 5

I'd say roughly around 0%. When you consider the mathematics of the existance of a single planet in the universe that is capable of supporting life, its roughly a 0% chance of it existing, and yet here Earth is, so the odds of another existing is really quite slim at best.

If there is life on another planet, as highly unlikely as it is, it is virtually impossible that we will ever know or find out simply because there isn't enough time or energy for space travel to be even remotely feasible outside of our solar system. Space travel even within our own solar system is difficult at best, and the energy expense is too high to ever be feasible beyond a possible moon or Mars base. So much for the delusions of Star Trek and Star Wars.

Answer 6

Good chance there are planets similar to Earth, given the countless billions of planets. But might not be as many as you think: our planet has a unique history (especially owing to that extremely large moon in the sky coming from a colossal impact).

Titan, actually, is quite similar to Earth, but instead of water its liquid methane. It might be capable of supporting certain forms of life.

Answer 7

There's a better chance of that than there is that any of us will win the lottery. It's a mathematical certainty that there is life on another planet.

Answer 8

I don't know but I have a feeling that we're not alone!