Hubble focuses on 'the great attractor'

Jan 23, 2013
Credit: ESA/Hubble & NASA

(Phys.org)—A busy patch of space has been captured in this image from the NASA/ESA Hubble Space Telescope. Scattered with many nearby stars, the field also has numerous galaxies in the background.

Located on the border of Triangulum Australe (The Southern Triangle) and Norma (The Carpenter's Square), this field covers part of the Norma Cluster (Abell 3627) as well as a dense area of our own galaxy, the Milky Way.

The Norma Cluster is the closest cluster to the Milky Way, and lies about 220 million light-years away. The enormous mass concentrated here, and the consequent gravitational attraction, mean that this region of space is known to astronomers as the Great Attractor, and it dominates our region of the Universe.

The largest galaxy visible in this image is ESO 137-002, a seen edge on. In this image from Hubble, we see large regions of dust across the galaxy's bulge. What we do not see here is the tail of glowing X-rays that has been observed extending out of the galaxy—but which is invisible to an optical telescope like Hubble.

Observing the Great Attractor is difficult at . The plane of the Milky Way—responsible for the numerous bright stars in this image—both outshines (with stars) and obscures (with dust) many of the objects behind it. There are some tricks for seeing through this—infrared or radio observations, for instance—but the region behind the center of the Milky Way, where the dust is thickest, remains an almost complete mystery to astronomers.

This image consists of exposures in blue and infrared light taken by Hubble's Advanced Camera for Surveys.

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vidyunmaya
1 / 5 (3) Jan 24, 2013
Transition from Shaded concept at Milkyway to heart and Beyond -This image at 22x10^8 LY helps Expansion.

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