M2 9: Wings of a Butterfly Nebula
Explanation:
Are stars better appreciated for their art after they die?
Actually, stars usually create their most artistic displays
as they die.
In the case of low-mass stars like our
Sun and
M2-9 pictured above, the stars transform themselves from normal
stars to
white dwarfs
by casting off their outer gaseous envelopes.
The expended gas frequently forms an impressive display called a
planetary nebula
that fades gradually over thousands of years.
M2-9, a butterfly
planetary nebula 2100
light-years away shown in representative colors,
has wings that tell a strange but
incomplete tale.
In the center,
two stars orbit inside a
gaseous disk 10 times the orbit of
Pluto.
The
expelled envelope
of the dying
star breaks out from the
disk creating the
bipolar appearance.
Much remains unknown about the physical processes that cause
planetary nebulae.
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.
