Figure 18-9: RIVUXG
Bok Globules The dark blobs in this photograph of a glowing H II region are clouds of dust and gas called Bok globules. A typical Bok globule is a parsec or less in size and contains from one to a thousand solar masses of material. The Bok globules and H II region in this image are part of a much larger star-forming region called NGC 281, which lies about 2900 pc (9500 ly) from Earth in the constellation Cassiopeia. The image shows an area about 2.7 pc (8.8 ly) across.
Bok Globules The dark blobs in this photograph of a glowing H II region are clouds of dust and gas called Bok globules. A typical Bok globule is a parsec or less in size and contains from one to a thousand solar masses of material. The Bok globules and H II region in this image are part of a much larger star-forming region called NGC 281, which lies about 2900 pc (9500 ly) from Earth in the constellation Cassiopeia. The image shows an area about 2.7 pc (8.8 ly) across.
(NASA, ESA, and The Hubble Heritage Team [STScI/AURA])