Today, July 23, 2015, NASA introduced us to Kepler 452b. This rocky planet orbits a star very similar to our own, has a year of 385 days, and gravity roughly double that of Earth’s. It has been within the habitable zone of its star for 6 billion years which is older than the Earth, giving the planet plenty of time for life to arise. The image above is an artists rendition of what the planet might look like. Unfortunately, Kepler 452b is 1,400 light years away but it is more likely to support life than anything we have discovered so far.
If earth was 50% larger in diameter gravity would be so high that chemical rockets would'nt be able to break the earths pull and our intire space adventure vould be nothing but a Jules Verne story.
So if the folks at Kepler 425b are like us we're just a story and a dream for them, nothing they can come and see.
My point is, it's too far way for any of our instruments to measure the 'actual' habitable zone of that system. Too much guesswork going on.