When one views the distinctive Dumbbell Nebula (M27) in stereo, the two-dimensional dumbbell shape transforms into the object’s true shape: a three-dimensional bloated sphere. Such planetary nebulae form from low-velocity gas belched away from the parent star, which is followed by higher-velocity ejections. The collision between the gas clouds helps to light them up, giving us such a majestic view.
Stereo images by J.-P. Metsävainio