That could be particularly interesting, because whether or not a planet has a magnetic field may be an important factor in habitability. Gregg Hallinan More Quotes by Gregg Hallinan More Quotes From Gregg Hallinan As the electrons spiral down toward the atmosphere, they produce radio emissions, and then when they hit the atmosphere, they excite hydrogen in a process that occurs at Earth and other planets, we now know that this kind of auroral behavior is extending all the way from planets up to brown dwarfs. Gregg Hallinan top-news
