THE USE OF A PLANE GRATING IN STELLAR SPECTRO-SCOPY.—In No. 5, vol. vi., of the Journal of the Royal Astronomical Society (Canada) there is an interesting note describing some preliminary tests, made ...
WE have recently obtained a series of spectra of the night sky in the wave-length region 1–2 µ. A lead sulphide cell was used as the detector in a grating spectrograph normally used for photographic ...
To the casual onlooker, the space between the stars is benign and quiet. However, this space — also called the interstellar medium is, in fact, very active and contains the raw materials for future ...
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