Astronomers have now observed the radio emission from the neutral hydrogen gas (HI) in a nearby galaxy. Hydrogen gas emits radio emission in a spectral line at a very specific frequency of 1420 MHz.

Cannon's speciality was identifying atomic line spectra in starlight. By passing starlight through a prism, the light could be spread out into a rainbow of colors. Rather than a smooth rainbow ...

Editorial Published: 30 May 1895 On the Line Spectra of the Elements C. RUNGE Nature 52, 106–108 (1895) Cite this article ...

Research Article Published: 18 February 1939 Atomic Lines in the Auroral Spectrum JOSEPH KAPLAN Nature 143, 278–279 (1939) Cite this article ...

Q210: Atomic Spectra – Colored Balloon Explosion Introduction Balloons filled with hydrogen and containing metal salts are ignited. When the balloon explodes, the characteristically colored flame for ...