View Full Version : Astrophoto: A Well-Rounded Glow

2012-Sep-20, 02:30 PM
The bubble nebula Abell 39. Credit: Adam Block/Mount Lemmon SkyCenter/University of Arizona In theory, planetary nebulae should be simple and spherical, like the soap bubbles you made as a child. But only a rare few actually are! Here’s an example of one of the almost perfectly round planetary nebulae. “Abell 39 is the quintessential bubble [...]

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