General astronomy

General astronomy

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General astronomy

axion

Astronomy; General astronomy

A hypothetical spin-0 particle with a very small mass of 10-5-10-3 eV. It was postulated in order to provide a natural solution to the "strong CP problem".

axis

Astronomy; General astronomy

Theoretical straight line through a celestial body, around which it rotates.

axisymmetric collapse

Astronomy; General astronomy

Collapse of mass in such a way that the mass maintains the symmetry of a cylinder.

1) Angular distance from the north point eastward to the intersection of the celestial horizon with the vertical circle passing through the object and the zenith. 2) Directional bearing around the ...

azimuthal quantum number (k)

Astronomy; General astronomy

A measure of the minor axis of an elliptic orbital of an electron according to the Bohr-Sommerfeld theory.

absorption

Astronomy; General astronomy

Decrease in the intensity of radiation, representing energy converted into excitation or ionization of electrons in the region through which the radiation travels. As contrasted with monochromatic ...