Image: Galaxy at the edge

Aug 30, 2010
Image Credit: NASA, ESA, K. Cook (LLNL)

Spiral galaxy NGC 4921 presently is estimated to be 320 million light years distant.

This image, taken by the Hubble Space Telescope, is being used to identify key stellar distance markers known as Cepheid variable stars.

The magnificent spiral NGC 4921 has been informally dubbed anemic because of its low rate of and low surface brightness.

Visible in the image are, from the center, a bright nucleus, a bright central bar, a prominent ring of dark dust, blue clusters of recently formed stars, several smaller companion galaxies, unrelated galaxies in the far , and unrelated stars in our Milky Way Galaxy.

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frajo
not rated yet Aug 31, 2010
LSB galaxies like this one are quite interesting as their rotation curves cannot be replicated by numerical simulations of the cold dark matter hypothesis.