Four Gallaxies Collide

Four gigantic galaxies have been seen crashing into one another in one of the biggest cosmic collisions ever seen. A US team of astronomers observed the four-way cosmic smash-up using Nasa's Spitzer and Chandra space telescopes along with ground-based observatories. The clashing galaxies are expected to eventually merge into a single, behemoth galaxy up to 10 times as massive as our own Milky Way.

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