Caldwell 23
Silver Sliver Galaxy
Caldwell 23, more widely recognized by its popular names—the Silver Sliver Galaxy and the Outer Limits Galaxy, the latter nickname originating from its distinctive appearance in the opening credits of the classic television show The Outer Limits—is an exceptionally striking edge-on spiral galaxy. This beautiful galaxy can be found within the boundaries of the constellation Andromeda, making it a fascinating object of interest for astronomers and stargazers alike.
Key Characteristics
Discovery:
It was first discovered by the astronomer William Herschel on October 6, 1784.
Scientific Designation:
It is primarily cataloged as NGC 891.
Distance:
Approximately 27 to 30 million light-years away from Earth.
Physical Characteristics:
It spans about 100,000 to 130,000 light-years in diameter, making it very similar in size and luminosity to our own Milky Way.
Visual Appearance:
Because it is viewed exactly edge-on, it appears as a thin, silver needle of light with a prominent, dark dust lane running across its center.