Definitions - a
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absolute zero - The temperature at which the particles of matter would have no kinetic energy.
acceleration - A change in the velocity of an object.
activity - The amount of particles being emitted from a radioactive source.
adjoint - The transpose of the conjugate of a matrix.
air resistance - Friction or drag that acts on an object when moving through air.
algebra - A branch of mathematics using letters to represent numbers to explore relations.
alpha decay - Type of radioactive decay that emits an alpha particle.
alpha particle - An alpha particle is the nucleus of a Helium atom. The particle consists of two protons and two neutrons.
amplitude - The maximum displacement of a wave.
angle - The degree of divergence between two intersecting lines.
angular acceleration - A change in the angular velocity of an object.
angular momentum -
angular velocity - A rotational change in position. i.e. rotational speed.
aphelion - Orbital position at which an object reaches its maximum distance from the sun.
apogee - Orbital position at which an object reaches its maximum position from the Earth.
area - Amount of two-dimensional space an object occupies.
asterism - A pattern seen in the stars.
asteroid - Rocks floating in space from dust sized up to many kilometers across, most are located between Mars and Jupiter.
astronaut - Someone who ventures into space.
astronomical unit -
astronomy - The study of objects outside of the Earth.
asymptote -
atmosphere - Gas layer on the outside of a planet.
atom -
attenuation - Reduction of the flow of something such as radiation.
avagadro's constant -
axis -
azimuth -
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