Any change in the speed with which an object moves, or the direction in which it moves.

Back to Top

Active Galactic Nucleus

The central portion of a galaxy which gives off unusually large amounts of energy. These are thought to be powered by supermassive Black Holes.

Back to Top


The height of the peak of a wave, measured relative to its center. Equivalently, the depth of the trough of a wave.

Back to Top


Essentially, the "opposite" of a particle. Every type of matter has a corresponding antiparticle, with the same mass but opposite charge, for example. Other numbers describing the particle will be reversed for the antiparticle.

Back to Top

Atomic Nucleus

The central part of an atom, which contains Neutrons and Protons. Electrons are usually found around the Nucleus. Strictly speaking, this is the only part of an atom involved in Nuclear Reactions (Fission or Fusion).

Back to Top

Four Areas of Science


Now, here, you see, it takes all the running you can do, to keep in the same place. If you want to get somewhere else, you must run twice as fast as that.

The Red Queen in Lewis Carroll's Through the Looking Glass

Featured Video

About SXS

The SXS project is a collaborative research effort involving multiple institutions. Our goal is the simulation of black holes and other extreme spacetimes to gain a better understanding of Relativity, and the physics of exotic objects in the distant cosmos.

The SXS project is supported by Canada Research Chairs, CFI, CIfAR, Compute Canada, Max Planck Society, NASA, NSERC, the NSF, Ontario MEDI, the Sherman Fairchild Foundation, and XSEDE.

Our Latest Tweet

RT @KeefeMitman: Nearly 50 years ago, my advisor, Saul Teukolsky, showed how a perturbed black hole rings down to a state of equilibrium. T…

SXS Project