**EMBARGOED UNTIL 9:00 AM EDT THURS., APRIL 24, 2008**This image made by the Hubble Space Telescope and released by NASA Thursday, April 24, 2008, shows Arp 302, which consists of a pair of very gas-rich spiral galaxies in their early stages of interaction: VV 340A is seen edge-on to the left and VV 340B face-on to the right. An enormous amount of infrared light is radiated by the gas from massive stars that are forming at a rate simila to the most vigorous giant star-forming regions in our own Milky Way. This image is part of a large collection of 59 images of merging galaxies taken by Hubble to mark its 18th launch anniversary. (AP Photo/NASA; ESA)
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**EMBARGOED UNTIL 9:00 AM EDT THURS., APRIL 24, 2008**This image made by the Hubble Space Telescope and released by NASA Thursday, April 24, 2008 shows the NGC 6670 pair of overlapping edge-on galaxies. Scientists believe that NGC 6670 has already experienced at least one close encounter and is now in the early stages of a second. The nuclei of the two galaxies are approximately 50,000 light-years apart. NGC 6670 glows in the infrared with more than a hundred billion times the luminosity of our Sun and is thought to be entering a starburst phase. The pair is located some 400 million light-years away from Earth.This image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released to mark its 18th launch anniversary.(AP Photo/NASA, ESA,)
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**EMBARGOED UNTIL 9:00 AM EDT THURS., APRIL 24, 2008**These are some of the 59 new images of colliding galaxies that make up the largest collection of Hubble images ever released together by NASA. As this astonishing Hubble atlas of interacting galaxies illustrates, galaxy collisions produce a remarkable variety of intricate structures. Interacting galaxies are found throughout the Universe, sometimes as dramatic collisions that trigger bursts of star formation, on other occasions as stealthy mergers that result in new galaxies. The series of images from the NASA/ESA Hubble Space Telescope was released April 24, 2008, to mark the 18th anniversary of the telescopes launch. Each of the various merging galaxies in this series of images is a snapshot of a different instant in the long interaction process.(AP Photo/NASA/ESA)
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**EMBARGOED UNTIL 9:00 AM EDT THURS., APRIL 24, 2008** This image made by the Hubble Space Telescope and released by NASA Thursday, April 24, 2008 shows a pair of interacting galaxies consisting of NGC 5754, the large spiral on the top and NGC 5752, the smaller companion in the bottom left corner of the image. The contrasting reactions of the two galaxies to their interaction are due to their differing masses and sizes. The photos were released to mark the Hubble Space Telescope's 18th launch anniversary. (AP Photo/NASA, ESA)
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This image made by the Hubble Space Telescope and released by NASA Thursday, April 24, 2008 , shows a Hubble view of Arp 81 is a strongly interacting pair of galaxies, seen about 100 million years after their closest approach. It consists of NGC 6621, to the left, and NGC 6622, to the right. NGC 6621 is the larger of the two, and is a very disturbed spiral galaxy. The encounter has pulled a long tail out of NGC 6621 that has now wrapped behind its body. The collision has also triggered extensive star formation between the two galaxies. Scientists believe that Arp 81 has a richer collection of young massive star clusters than the notable Antennae galaxies, which are much closer than Arp 81. The pair is located in the constellation of Draco, approximately 300 million light-years away from Earth. This image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released on its 18th launch anniversary on April 24, 2008.(AP Photo/NASA, ESA)
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**EMBARGOED UNTIL 9:00 AM EDT THURS., APRIL 24, 2008** This image made by the Hubble Space Telescope and released by NASA Thursday, April 24, 2008 shows NGC 5331, a pair of interacting galaxies beginning to hold their arms. There is a blue trail which appears in the image flowing to the right of the system. NGC 5331 is very bright in the infrared, with about a hundred billion times the luminosity of the Sun. It is located in the constellation Virgo, the Maiden, about 450 million light-years away from Earth. This image is part of a collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released to mark its 18th launch anniversary.(AP Photo/NASA, ESA)
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**EMBARGOED UNTIL 9:00 AM EDT THURS., APRIL 24, 2008**This image made by the Hubble Space Telescope and released by NASA Thursday, April 24, 2008, displays a beautiful pair of interacting spiral galaxies with swirling arms. The smaller of the two, dubbed LEDA 62867 and positioned to the left of the frame, seems to be safe for now, but will probably be swallowed by the larger spiral galaxy; NGC 6786, right, eventually. There is already some disturbance visible in both components. A supernova was seen to explode in the large spiral in 2004. NGC 6786 is located in the constellation of Draco; the Dragon; about 350 million light-years away. This image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released to mark its 18th launch anniversary.(AP Photo/ NASA, ESA)
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**EMBARGOED UNTIL 9:00 AM EDT THURS., APRIL 24, 2008** This image made by the Hubble Space Telescope and released by NASA Thursday, April 24, 2008 shows Arp 148, the aftermath of an encounter between two galaxies, resulting in a ring-shaped galaxy and a long-tailed companion. The collision between the two parent galaxies produced a shockwave effect that first drew matter into the center and then caused it to propagate outwards in a ring. The elongated companion perpendicular to the ring suggests that Arp 148 is a unique snapshot of an ongoing collision. Arp 148 is nicknamed Mayalls object and is located in the constellation of Ursa Major, the Great Bear, approximately 500 million light-years away. This image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released on its 18th launch anniversary.(AP Photo/NASA, ESA)
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**EMBARGOED UNTIL 9:00 AM EDT THURS., APRIL 24, 2008**This image made by the Hubble Space Telescope and released by NASA Thursday, April 24, 2008 , shows NGC 520, the product of a collision between two disc galaxies that started 300 million years ago. It exemplifies the middle stages of the merging process: the discs of the parent galaxies have merged together, but the nuclei have not yet coalesced. NGC 520 is one of the brightest galaxy pairs on the sky, and can be observed with a small telescope toward the constellation of Pisces, the Fish, having the appearance of a comet. It is about 100 million light-years away and about 100,000 light-years across. This image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released on its 18th launch anniversary.(AP Photo/NASA, ESA)
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**EMBARGOED UNTIL 9:00 AM EDT THURS., APRIL 24, 2008** This image made by the Hubble Space Telescope and released by NASA Thursday, April 24, 2008 , shows a Hubble view of Arp 272, a remarkable collision between two spiral galaxies, NGC 6050 and IC 1179, and is part of the Hercules Galaxy Cluster, located in the constellation of Hercules. The galaxy cluster is part of the Great Wall of clusters and superclusters, the largest known structure in the Universe. The two spiral galaxies are linked by their swirling arms. Arp 272 is located some 450 million light-years away from EarthThis image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released on its 18th launch anniversary.(AP Photo/NASA, ESA)
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