Thursday, February 9, 2012



Galaxies

Galaxies
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Galaxies

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Galaxies

HCG 87: A Small Group of Galaxies

by Father Sky

Sometimes galaxies form groups. For example, our own Milky Way Galaxy is part of the Local Group of Galaxies. Small, compact groups, like Hickson Compact Group 87 (HCG 87) shown above, are interesting partly because they slowly self-destruct. Indeed, the galaxies of HCG 87 are gravitationally stretching each other during their 100-million year orbits around [...]

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The Leo Triplet Galaxies From VST

by Father Sky

This popular group is famous as the Leo Triplet - a gathering of three magnificent galaxies in one field of view. Crowd pleasers when imaged with even modest telescopes, these galaxies can be introduced individually as NGC 3628 (top), M66 (bottom left), and M65 (bottom right). All three are large spiral galaxies. They tend to [...]

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NGC 3314 When Galaxies Overlap

by Father Sky

NGC 3314 is actually two large spiral galaxies which just happen to almost exactly line up. The foreground spiral is viewed nearly face-on, its pinwheel shape defined by young bright star clusters. But against the glow of the background galaxy, dark swirling lanes of interstellar dust appear to dominate the face-on spiral's structure. The dust [...]

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The Perseus Cluster of Galaxies

by Father Sky

Here is one of the largest objects that anyone will ever see on the sky. Each of these fuzzy blobs is a galaxy, together making up the Perseus Cluster, one of the closest clusters of galaxies. The cluster is seen through a foreground of faint stars in our own Milky Way Galaxy. Near the cluster [...]

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Abell 2744 Pandora's Cluster of Galaxies

by Father Sky

Why is this cluster of galaxies so jumbled? Far from a smooth distribution, Abell 2744 not only has knots of galaxies, but the X-ray emitting hot gas (colored red) in the cluster appears distributed differently than the dark matter. The dark matter, taking up over 75 percent of the cluster mass and colored blue in [...]

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Black Holes in Merging Galaxies

by Father Sky

Violent galaxy mergers can feed supermassive black holes. Theoretically, the result is intense emission from regions near the supermassive black holes, creating the some of the most luminous objects in the universe. Astronomers dub these Active Galactic Nuclei, or just AGN. But for decades only about 1 percent of AGN seemed to be associated with [...]

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The Coma Cluster of Galaxies

by Father Sky

Almost every object in the above photograph is a galaxy. The Coma Cluster of Galaxies pictured above is one of the densest clusters known - it contains thousands of galaxies. Each of these galaxies houses billions of stars - just as our own Milky Way Galaxy does. Although nearby when compared to most other clusters, [...]

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Cosmic Voyage HD 1 of 3

by Father Sky

Morgan Freeman narrates this film, as you travel from the outer reaches of space down into the nucleus of a carbon atom. Cosmic Voyage explains, in layman's terms, how the universe began - the "Big Bang" and how the entire mass of the universe was compressed into a space the size of a tennis ball. [...]

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Virgo Cluster Galaxies

by Father Sky

Well over a thousand galaxies are known members of the Virgo Cluster, the closest large cluster of galaxies to our own local group. In fact, the galaxy cluster is difficult to appreciate all at once because it covers such a large area on the sky. Spanning about 5x3 degrees, this careful mosaic of telescopic images [...]

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Peculiar Galaxies of Arp 273

by Father Sky

The spiky stars in the foreground of this sharp cosmic portrait are well within our own Milky Way Galaxy. The two eye-catching galaxies lie far beyond the Milky Way, at a distance of over 300 million light-years. Their distorted appearance is due to gravitational tides as the pair engage in close encounters. Cataloged as Arp [...]

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Galaxies Beyond the Heart: Maffei 1 and 2

by Father Sky

The two galaxies on the far left were unknown until 1968. Although they would have appeared as two of the brighter galaxies on the night sky, the opaque dust of the central band of our Milky Way Galaxy had obscured them from being seen in visible light. The above image in infrared light taken by [...]

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Astronomy Today Vol 2: Stars and Galaxies

by Father Sky

Product Description This straightforward volume presents a broad view of astronomy spanning known facts, evolving ideas, and frontier discoveries. The authors combine qualitative reasoning and analogies with familiar objects and phenomena to awaken readers to the excitement of the universe around them. Incorporates new understanding and emphases in contemporary astronomy, including the latest data on [...]

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