The nongravitational interactions of dark matter in colliding galaxy clusters

@article{Harvey2015TheNI,
  title={The nongravitational interactions of dark matter in colliding galaxy clusters},
  author={David R. Harvey and Richard J. Massey and Thomas D. Kitching and Andy N. Taylor and Eric R. Tittley},
  journal={Science},
  year={2015},
  volume={347},
  pages={1462 - 1465}
}
Uncloaking the influence of the invisible actor The idea of dark matter enjoys popular support, but two major concerns persist: the so-called Standard Model excludes it, and it cannot be directly detected by any telescope. For now, astronomers can only observe dark matter's influence indirectly, such as when watching unseen creatures perturb the surface of a pond. Harvey et al. observed 72 galaxy collisions to compare the resulting centers of mass for the gas and stars (from direct observations… 
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