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sideband

(Encyclopedia)sideband, any frequency component of a modulated carrier wave other than the frequency of the carrier wave itself, i.e., any frequency added to the carrier as a result of modulation; sidebands carry t...

sidereal period

(Encyclopedia)sidereal period, in astronomy, length of time a body takes to complete an orbit relative to the fixed stars. See sidereal time. ...

RFID

(Encyclopedia)RFID: see radio-frequency identification. ...

Salonen, Esa-Pekka

(Encyclopedia)Salonen, Esa-Pekka, 1958–, Finnish conductor and composer. Originally a French horn player, he studied (1973–77) at Helsinki's Sibelius Academy. He made his conducting debut (1979) with the Finnis...

Penzias, Arno Allan

(Encyclopedia)Penzias, Arno Allan, 1933–, German-American physicist, b. Munich, Germany, Ph.D. Columbia Univ., 1962. He fled Nazi Germany with his family and after finishing school began work at Bell Telephone La...

observatory, orbiting

(Encyclopedia)observatory, orbiting, research satellite designed to study solar radiation, electromagnetic radiation from distant stars, the earth's atmosphere, or the like. Because the atmosphere and other aspects...

automatic direction finder

(Encyclopedia)automatic direction finder: see radio range. ...

cluster

(Encyclopedia)cluster, in astronomy: see star cluster; galaxy. ...

gibbous phase

(Encyclopedia)gibbous phase gĭbˈəs [key]: see phase, in astronomy. ...