Repulsive Force (other)
Repulsive force may refer to: * A repulsive force of an accelerating universe, which according to certain theories causes planets and matter to get farther and farther apart * Like charges repelling according to Coulomb's law * Repulsive force (magnetism) between magnets of opposite orientation * A compressed material repelling bodies on both sides, e.g. according to Hooke's law * Repulsive force (biology), associated with involuntarily vomiting, as in response to ingestion of a toxin See also

* Repulsion (other) {{disambig ...
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Accelerating Universe
Observations show that the expansion of the universe is accelerating, such that the velocity at which a distant galaxy recedes from the observer is continuously increasing with time. The accelerated expansion of the universe was discovered during 1998 by two independent projects, the Supernova Cosmology Project and the High-Z Supernova Search Team, which both used distant type Ia supernovae to measure the acceleration. The idea was that as type Ia supernovae have almost the same intrinsic brightness (a standard candle), and since objects that are further away appear dimmer, we can use the observed brightness of these supernovae to measure the distance to them. The distance can then be compared to the supernovae's cosmological redshift, which measures how much the universe has expanded since the supernova occurred; the Hubble law established that the further an object is from us, the faster it is receding. The unexpected result was that objects in the universe are moving away from ...
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