Science & Tech
2
At the Lyman Laboratory of Physics at Harvard University in 1951, Harold I. Ewen and Edward M. Purcell used this horn antenna for the first detection of radio radiation from neutral atomic hydrogen gas in the Milky Way at a wavelength of 21 centimeters.
Hear stories like this as you drive
ExploreHere reads historical markers out loud as you pass them: over 325,000 stories across the US. No account needed.
4.7 · 800+ ratings · Free
FIND IT
Green Bank, West Virginia · United States
