This new information makes it pretty clear that the cause of the Pioneer Anomaly, that is the deviation of the Pioneer spacecraft from the trajectories dictated by gravity alone, is due to thermal sources internal to the spacecraft. A satisfying result, though it produces no new physics.
Sorry Stephen Hawking, I agree with Jill Tarter. Hostile alien invaders are unlikely–at least not the kind envisioned in SciFi movies. I received the news release reproduced below and it reminded me of a book manuscript that I now have under consideration at a major publisher of books for young readers. That manuscript looks ahead … Read more