Archives: Glossary Terms: 691 terms

Circumpolar stars never set or go below the horizon for observers from specific latitudes. They are visible to observers from ...

A torus or ring-shaped accumulation of gas, dust, or other debris in orbit around a star in different phases of ...

California Institute of Technology, Caltech.

Geostationary orbit.

Complex Monitor and Control, a subsystem at DSCCs.

Centre National d'etudes Spatiales, France.

Two-way communications mode wherein the spacecraft generates its downlink frequency based upon the frequency of the uplink it receives.

Aligning the optical elements of a telescope so that they all point in the proper direction. Most reflectors and compound ...

An area of dust or gas surrounding the nucleus of a comet.

A is a 'dirty snowball” of ice and rocky debris, typically a few miles across, that orbits the Sun in ...