An animated image shows a collision between two subatomic particles embedded in our 3-D universe (or "brane"). The collision produces other particles, including a graviton that escapes from our brane into the extradimensional "bulk" that lies beyond.
The Week in Pictures A giant praying mantis, Festival of Sacrifice, bubble in space, Bhopal, military farewell, Afghanistan marine, Italian justice and more news and feature images from around the world.
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