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Astronomy Picture of the Day
M57: The Ring Nebula
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#89974
by
[z]Barbara Harris
@
26.06.2006 00:00
- nach oben -
M57: The Ring Nebula
Explanation:
It looked like a ring on the sky.
Hundreds of years ago
astronomers
noticed a nebula with a most unusual shape.
Now known as
M57
or NGC 6720, the gas cloud became popularly known as the
Ring Nebula
.
It is now known to be a
planetary nebula
,
a gas cloud emitted at the end of a Sun-like star's existence.
As one of the brightest
planetary nebula
on the sky,
the Ring Nebula can be seen with a small telescope in the constellation of
Lyra
.
The Ring Nebula lies about 4,000
light years
away, and is roughly 500 times the diameter of
our Solar System
.
In
this recent picture
by the
Hubble Space Telescope
,
dust filaments and globules
are visible far from the central star.
This helps indicate that the Ring Nebula is not spherical, but
cylindrical
.
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