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Medusa Nebula (Planetary Nebula)


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Medusa Nebula (メデューサ星雲)
Planetary Nebula (惑星状星雲)
Nb PN

別名 (Other names)
Sharpless 2-274, Sh2-274, PK 205+14 1, Abell 21

距離 (Distance)
1,500光年 (1,500 light-years)

星座 (Constellation)
ふたご座 (Gem) (Gemini)

Medusa Nebula is a planetary nebula located 1,500 light years from the Earth in the constellation Gemini.

Medusa Nebula (Planetary Nebula) : Picture

Medusa Nebula
Medusa Nebula
(C) NASA

Medusa Nebula
The Medusa Nebula
(C) NASA
Braided, serpentine filaments of glowing gas suggest this nebula's popular name, The Medusa Nebula. Also known as Abell 21, this Medusa is an old planetary nebula some 1,500 light-years away in the constellation Gemini. Like its mythological namesake, the nebula is associated with a dramatic transformation. The planetary nebula phase represents a final stage in the evolution of low mass stars like the sun, as they transform themselves from red giants to hot white dwarf stars and in the process shrug off their outer layers. Ultraviolet radiation from the hot star powers the nebular glow. The Medusa's transforming star is near the center of the overall bright crescent shape. In this deep telescopic view, fainter filaments clearly extend below and to the left of the bright crescent region. The Medusa Nebula is estimated to be over 4 light-years across.

Medusa Nebula
The Medusa Nebula
(C) Bob Franke (Focal Pointe Observatory)
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