An Etymological Dictionary of Astronomy and Astrophysics
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A device in which an electronic detection system receives pulses that are proportional to the number of ions formed in a gas-filled tube by ionizing radiation.

→ proportional; → counter.

A device that records counts the total number of pulses received over a given time interval.

→ pulse; → counter.

The representation in → radio wavelengths of an astronomical object that has emission in other parts of the → electromagnetic spectrum.

→ radio; → counterpart.

A device for detecting and measuring ionizing radiation by means of flashes produced when the radiation particles strike a sensitive layer of phosphor.

→ scintillation; → counter.

The number of stars that appear in a given region of sky, usually counted on a photographic plate or CCD image.

→ star; → count.

In a star cluster, a → close encounter that strongly changes a star's velocity.

→ strong; → encounter.

In a → star cluster, an → encounter that occurs at a distance and produces only very small changes in a star's velocity.

→ weak; → encounter.