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The bubbles may be the result of "a wave of starbirth at the galaxy’s center millions of years ago," says Ron Cowen at Science News. The stars' "explosive deaths" could have emitted enough energy to create such huge growths. A more plausible theory involves the "supermassive black hole" that scientists know "resides at the center of our galaxy."The Milky Way's giant 'space bubbles'
My guess to you'r first pictures would be star explosions.
For that ↑ particular image: Initial thought = fungus or mold.
there are even bubbles that look like a "red blood cell"
Originally posted by P-M-H
you know those are probably not bubble size right. but must be massive
maybe somthing is trying to be protected
Originally posted by Pervius
If a Star exploded millions of light years away wouldn't it look like a bubble from our perspective as the blast ring slowly expanded (bubble).
Even with the Speed of Light.....it would take awhile to "expand"...being we're so far away. Well the bubble expanded and doesn't exist anymore....but we're only seeing a bubble as the visible light takes so long to get here.
The key to the escape of radiation can be found in the unusual, distorted shape of the newly observed galaxy. It appears that the object had recently been hit by another galaxy, creating a hole in its halo, allowing radiation to pass through.