Last week, the Kepler mission discovered another Earth-like planet, Kepler 452b, which is being deemed "Earth's bigger, older cousin" located about 1,400 light years from Earth in the habitable zone of a star similar to ours (aka a yellow dwarf). This brings the total number of confirmed planets to 1,030. Last year was Kepler 186f, 490 light years from Earth and very close in size to our planet in the habitable zone of a red dwarf star/sun. See the Kepler 452b briefing here:
Kepler 452b Briefing Materials
We now know that Earth-like planets located in the 'habitable zone' of stars do exist. The Earth is not a unique planet. We don't know yet if any of these harbour life but at least we know there is more than 1 Class-M planet in the universe so it is very possible there is or was life on these planets. I wish I could be alive when they find out. THAT would be so exciting.