The World Around Us

The Pleiades is one of the nearest star clusters to Earth, dependent for its formation and continuing maintenance on an exact balance between constants.

The Pleiades, one of the nearest star clusters to Earth, in the constellation of Taurus. Dependent for its formation on the precise ratio of strong nuclear and electromagnetic forces and its continued maintenance on a virtually exact balance between electromagnetic and gravitational constants.

Credit: NASA/ESA/AURA/Caltech