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NGC 6781 (Planetary Nebula)


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NGC 6781
Planetary Nebula (惑星状星雲)
Nb PN

別名 (Other names)
PK 41-2.1

明るさ (Brightness)
11.4等級

星座 (Constellation)
わし座 (Aql) (Aquila)


距離 (Distance)
5,000光年 (5,000 light-years)

NGC 6781 is a planetary nebula located 5,000 light years from the Earth in the constellation Aquila.

NGC 6781 (Planetary Nebula) : Picture

NGC 6781 (Planetary Nebula)
NGC 6781 (Planetary Nebula)
(C) ESO
Stars such as our Sun do not contain enough mass to finish their lives in the glorious explosions known as supernovae. However, they are still able to salute their imminent demise into dense, Earth-sized embers called white dwarfs by first expelling colourful shells of gas known as planetary nebulae. This misnomer comes from the similarity in appearance of these spherical mass expulsions to giant planets when seen through small telescopes.

NGC 6781 is a nice representative of these cosmic bubbles. The planetary nebula lies a few thousand light-years away towards the constellation of Aquila and is approximately two light-years across. Within NGC 6781, shells of gas blown off from the faint, but very hot, central star’s surface expand out into space. These shells shine under the harsh ultraviolet radiation from the progenitor star in intricate and beautiful patterns. The central star will steadily cool down and darken, eventually disappearing from view into cosmic oblivion.

NGC 6781 (Planetary Nebula)
NGC 6781 (Planetary Nebula)
(C) ESO
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NGC 6781 (Planetary Nebula) : Movie

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