General astronomy

General astronomy

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General astronomy

Amalthea (Jupiter V, Barnard's satellite)

Andromeda I

Astronomy; General astronomy

Dwarf spheroidal galaxy in the Andromeda subgroup of the Local Group. It is among the intrinsically faintest members of the Local Group.

A comet's atmosphere (composed of dust and/or various gases) surrounding its nucleus. The coma is rather tenuous (except very close to the nucleus), and stars can be occasionally easily seen through ...

barycentric dynamical time (TDB)

Astronomy; General astronomy

Differing from TDT only via periodic variations, TDB is used in ephemerides and equations of motion that refer to the barycenter of the solar system.

comet

Astronomy; General astronomy

A celestial body orbiting the sun (though some may be ejected from the solar system by planetary perturbations) that displays (at least during a portion of its orbit) some diffuseness and/or a "tail" ...

degree

Astronomy; General astronomy

A unit used in the measurement of angles, heavily used particularly in astronomy. Due to ancient Babylonian mathematics, we still divide a circle into 360 even units of arc and call each of these ...

alpha decay

Astronomy; General astronomy

1) Spontaneous emission by a heavier element (such as uranium) of positively charged helium nuclei - alpha particles - comprising 2 protons and 2 neutrons. The result of this radioactive decay is ...