re: BAD Astronomy
The aliens are fake, too, so should I just not watch the show?
The program is aiming at scientific plausibility. Since we haven't found any aliens yet (Mexican sightings aside), so long as the planetary system is also plausible, I am not going to worry about whether it actually exists or not.
How about we all just glad that a program is exploring the idea of alien life and that it isn't just an episode of Star Trek?