We should fund the space program so we could find habitable planets because then we might be able to find other living organisms or other elements that we might need. And also if we ever have to leave this planet, assuming we have the technology, we would have another planet to go to. Another thing to consider is that the planet may have resources that we might need to survive longer on are own planet.
We have already found habitable exoplanets outside our solar system that we think may be able to support life, one of the most notable being a planet around Gliese 581. Not to mention our own planets, such as Titan and Europa, which may hold extraterrestrial, yet primitive life. Plus, there may be planets on the other side of the universe that could hold life. Right now, it could be in your line of sight without you knowing.
And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be one fold, and one shepherd. John 10:16. This is either one, or both of two theories. The theory that there are people/beings on other planets or the Mormon belief that he went to the Americas. I'll let you decide but personally I believe both.
Science estimates that there are at least a billion galaxies in the known universe, that each galaxy has about a billion or more suns, and that each sun has on average at least one planet. This would mean that there are over a billion squared amount of planets in the know universe. From that you divide by the likelihood of planet being close enough to the sun to sustain life. You also divide the likelihood of it being the right sizes to support an atmosphere. It would also have to have other factors. According to one site I went to, in an area with about 42,000 stars, they found 10 planets that were in the habitual zone and about the size of the earth. If this is an average of the known universe that means that there are trillions of these planets and many would have similar atmospheres to earth. This does not mean that they would have life though. The odds of life forming are even greater than the odds of a habitable planet. If we went there, we would have most likely have to bring things in order to habitat the planet like seeds and other such things. Then, after we have grown enough plant, and other life can we actually use it for human life to continue.
The fact that we are living on a habitable world should be all the proof you need. Since the Earth exists there is bound to be more worlds out there that can sustain life. It also depends on you definition of a habitable world and who will be inhabiting it.
Whether we will ever reach another habitable world, is yet to be known. A few centuries ago people didn't think flying was possible, people didn't think we would reach the moon, Humans have eventually proven doubters wrong and did things many thought were impossible.
People keep expecting things to happen quickly, it took thousands of years, before we could make ships capable of taking us safely to other continents, why should it be any easier to reach other worlds, chances are we won't be alive to see it.
Yes, of course there are habitable 'worlds' beyond our earth. We live in one small galaxy. We are one little speck in the universe. In a whole other galaxy, there may be humans just like us who walk and talk and go to Starbucks. Well, maybe not exactly like that, but surely there are other life forms beyond little Earth.
There's literally more stars in the galaxy than there are grains of sand on a beach. Those stars each may have planets on them. And this is our galaxy alone, the milky way galaxy isn't the only galaxy in space. So, knowing that there's probably billions of galaxies in the universe, and that each of them have billions of stars (which may have planets), to assume that Earth is the only one at the right distance to the sun to sustain life is.... Well stupid. I know everyone's entitled to their own opinion & beliefs, but this is a case where you'd be stupid.
Our whole cosmos is so vast, and large that you don't even have to go very far to find habitable planets. Even Mars is borderline habitable compared to all the other planets in our solar system. Mars has water, and is better fit to sustain life than even our own moon. This is just in our solar system, there are trillions upon trillions of other solar systems, and it does not mathematically fit that the only habitable planets exist are anchored to this very very very minuscule shred of existence in our every vast cosmos.
God created Earth and only Earth. He did not create any other planet! You are all delusional! I can't believe you all believe in other worldly, green, big headed, aliens who probe us. Repent. God will still forgive you. God only created us. He created Adam and Eve, not Adam, Eve, Alien, Alien.