Is there another earth in another galaxy?

Answer 1

Of course! Not necessarily a planet just like Earth, but so far telescopes such as the old Kepler telescope over many years have found that about a fifth of all stars in the galaxy are likely to have at least one Earth-like planet. This doesn't necessarily guarantee that those planets will even have life, but it does show that there are about 11 billion such planets in this galaxy that are just like Earth, being the same size and distance from their stars, and having the same opportunity to sustain life. This probably means nothing to us since sending a small probe to even the nearest star system within a lifetime would require nearly the World's entire yearly energy output, but it's still an interesting thought. As for another Earth in a completely different galaxy? Well, there are a lot of galaxies similar to our own, so it's more likely than not that one of those galaxies would have at least 1 Earth-like planet.