Our galaxy is 100,000 light years across, and it is more than four years’ light traveling time even to Proxima Centauri, the closest star to the sun and home, possibly to a habitable planet rather like Earth. …But that is not what the linked article says about Proxima B.
The planet is rocky, of a similar mass to Earth, and temperate — all conditions that are promising for life. But Proxima B isn’t a second Earth. “The similarities end there,” says [Guillem] Anglada-Escudé. Even our knowledge of the surface temperature is fairly uncertain, ranging from a possible –33°C to the high hundreds, depending on its atmosphere.Quite a bit of leeway in the speculation.
That’s just the average temperature. However, Proxima B and its star are probably tidally locked, so the same face of the planet always points towards the star. So one half of the globe is in perpetual day, the other in never-ending night. “That’s not very Earth-like,” Anglada-Escudé says. …
Venus also rotates slowly--116 days from one sunrise to the next. I read somewhere that it always has the same side facing the earth, but I'm not sure if that is correct.