NGC 3079: Galactic bubbles play cosmic pinball with energetic particles

We all know bubbles from soapy baths or sodas. These bubbles of everyday experience on Earth are up to a few inches across, and consist of a thin film of liquid enclosing a small volume of air or other gas. In space, however, there are very different bubbles--composed of a lighter gas inside a heavier one--and they can be huge.