by Doctor Science
ALPHA CENTAURI HAS A PLANET! Phil Plait at Bad Astronomy put it in all caps, and I don't blame him one bit.
ALPHA CENTAURI B HAS A PLANET.
The planet (currently euphoniously called "Alpha Centauri Bb") is only a hair larger than Terra: 1.13 Earth masses. Alas, like many known exoplanets it is *way* closer to its star than we would find comfy: 0.04 AU, only 6 million km (4M miles). You can read the full paper[pdf] for more details.
BUT. It has a planet. It's likely to have more planets. We could get there. The fiction is no doubt all Jossed, but that's what science is for. Getting new ideas is what both science *and* fiction are for.