Infrakrasnoe izluchenie
Kosmicheskoe izluchenie v intervale dlin voln ot 1 mm (1000 mkm) do 0.8 mkm. Glazom ne vosprinimaetsya. Naibolee dlinnovolnovoe izluchenie (ot 5 mkm i vyshe) pogloshaetsya atmosferoi i nablyudaetsya za predelami atmosfery (sm. Vneatmosfernaya astronomiya). V podavlyayushem bol'shinstve sluchaev I.I.K. - eto teplovoe izluchenie razlichnyh astronomicheskih ob'ektov: planet, zvezd, pylevyh obolochek vokrug zvezd, oblakov mezhzvezdnoi pyli v galaktikah. Samym yarkim istochnikom I.I.K. dlya nas yavlyaetsya Solnce. Samye dalekie i moshnye istochniki I.I.K. v prirode - eto kvazary i yadra galaktik. Moshnost' ih infrakrasnogo izlucheniya v otdel'nyh sluchayah prevyshaet 1038 Vt.
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