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A Planetary Nebula in the Making
A proto-planetary nebula. A dying star (hidden behind dust and gas in the center of the nebula) has ejected massive amounts of gas. Parts of the gas have reached tremendous velocities of up to one-and-a-half million kilometers per hour. Shown in blue is light from hydrogen and ionised nitrogen arising from supersonic shocks where the gas stream rams into the surrounding material.
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Nebula