Located in the constellation
of Scorpius, the Cats Paw Nebula resembles a faint, luminous
paw-print on the sky. Deep images reveal that the nebula is about
a degree across in the sky. At a distance of about 5500 light-years
away it is a truly vast structure spanning almost 100 light-years
across. The sculpted gases of NGC 6334 are illuminated by the
light of numerous powerful stars, some exceeding 10 solar masses.
Many of these luminous hot stars are surprisingly not visible
because they lie within the dusty plane of our galaxy. At infrared
wavelengths the numerous hot stars are revealed and the nature
of this object as a region of massive star formation becomes clear.
In the past decade water masers, molecular outflows, and x-ray
sources have provided direct evidence of clusters of protostars
within NGC 6334. The nebula was discovered by John Herschel in
1837, and the brief and uninformative description in his Cape
Observations catalog is a testament to its faintness. The ruddy
hue of this complex is the result of the absorption of blue light
by the ubiquitous dust clouds along our line of sight in the plane
of the Milky Way. The red, intricate bubble
in the lower right of the image is particularly striking and is
most likely either a star expelling large amounts of matter at
high speed as it nears the end of its life or the remnant of a
recent supernova.