The Medusa Nebula
From NASA’s Astronomy Picture of the Day
From NASA’s Astronomy Picture of the Day
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.
