At the dawn of the universe, there was only hydrogen and helium. These elements made up all the galaxies and all the stars. But stars fuse hydrogen and helium into heavier elements, and large stars ...
IN Prof. Runge's article on the spectra of the elements in last week's issue of NATURE (p. 607) he refers to my explanation of double lines in the spectra of gases (“Cause of Double Lines in Spectra,” ...
Distinguishing between planetary nebulae and supernova remnants often necessitates a multiwavelength observational approach due to their potential visual similarities, despite their fundamentally ...
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