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Gary Steigman

New Limit on Cosmic Antimatter

In the dramatic collision of two galaxy clusters in the Bullet Cluster, it wasn't the collision of a bullet and and an antibullet, or else the annihilation of matter and antimatter would have led to a strong gamma-ray signal that was not seen. This new result has been shown by

Prof. Gary Steigman in, and reported on in New Scientist at

The Bullet Cluster is so called because it reveals the aftermath of a collision of two clusters, each composed of dark matter and ordinary gas. The dark matter clumps -- revealed by gravitational lensing -- passed through each other easily, while the gas clumps collided and were distorted into bow shocks.

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