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Acceleration
Any change in the speed with which an object moves, or the direction in which it moves.
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.
Amplitude
The height of the peak of a wave, measured relative to its center. Equivalently, the depth of the trough of a wave.
Antiparticle
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.
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).
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