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A Spiral in Andromeda
RA 23h 22m 7.32s Dec 40° 50' 57.87"
30 million light years
10.5" x 2.5"
3.32 x 3.34 arcminutes
North is 158.5° left of vertical
ESA/Hubble & NASA
February 6, 2017
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ABOUT THIS IMAGE:
Not to be confused with our neighboring Andromeda Galaxy, the Andromeda constellation is one of the 88 modern constellations. More importantly for this image, it is home to the pictured NGC 7640.
different classifications are used to identify galaxies by shape and structure
NGC 7640 is a barred spiral type. These are recognizable by their
spiral arms, which fan out not from a circular core, but from an elongated
bar cutting through the galaxys center. Our home galaxy, the Milky
Way, is also a barred spiral galaxy. NGC 7640 might not look much like
a spiral in this image, but this is due to the orientation of the galaxy
with respect to Earth or to Hubble, which acted as photographer
in this case! We often do not see galaxies face on, which can make features
such as spiral arms less obvious.
NGC 7640 was discovered by William Herschel on October 17, 1786