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hydrogen line |
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hydrogen line [′hī·drə·jən ‚līn]
(spectroscopy) A spectral line emitted by neutral hydrogen having a frequency of 1420 megahertz and a wavelength of 21 centimeters; radiation from this line is used in radio astronomy to study the amount and velocity of hydrogen in the Galaxy. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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21-centimeter radiation |
21 April 21 August 21 augustus 21 centimeter radiation 21 centimetre radiation 21 CLW 21 cm line 21 cm radiation 21 December 21 February 21 January 21 July 21 June 21 June 21 March 21 May 21 November 21 October 21 Ramadan 21 September 21-acetoxypregnenolone 21-centimeter line 21-centimeter radiation 21-Centimetre Radiation21-cm line 21-cm radiation 21-Hydroxylase 21-Hydroxylase 21-hydroxyprogesterone 211 21364 | |||||
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