Question

This element is consumed in the CNO cycle and proton-proton chain. For 10 points each:
[10e] Name this most abundant element in the universe. A heavier isotope of this element is deuterium.
ANSWER: hydrogen [or H]
[10h] Transitions in the hyperfine structure of hydrogen create this spectral line, named for its wavelength. Radio waves in this feature are used to observe properties of galaxies.
ANSWER: 21 centimeter line [or 21 cm; reject equivalents of “21 centimeters”, such as “0.21 meters”]
[10m] Radio waves in the 21 centimeter line, unlike visible light, can also pass through this substance undeterred. The interstellar medium consists of gas, cosmic rays, and this substance.
ANSWER: cosmic dust [or extraterrestrial dust or interstellar dust or space dust or star dust]
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Summary

2024 ACF Fall at CornellfallY714.29100%43%0%
2024 ACF Fall at Ohio StatefallY717.14100%71%0%
2024 ACF Fall at WashingtonfallY120.00100%100%0%
2024 ACF Fall at GeorgiafallY1018.00100%60%20%
2024 ACF Fall at North CarolinafallY714.29100%43%0%
2024 ACF Fall at Claremont CollegesfallY512.00100%20%0%
2024 ACF Fall at RutgersfallY718.57100%71%14%
2024 ACF Fall at IllinoisfallY912.2289%33%0%

Data

Tennessee AAlabama A1001020
Auburn ASouth Carolina A10101030
Auburn ASouth Carolina A10101030
Auburn ASouth Carolina A10101030
Auburn ASouth Carolina A10101030
Auburn ASouth Carolina A10101030
Auburn ASouth Carolina A10101030
Auburn ASouth Carolina A10101030
Auburn ASouth Carolina A10101030
Auburn BSouthern100010
Mississippi State AAuburn C1001020
Georgia Tech BClemson A1001020
Emory AGeorgia Tech C100010
Tennessee BEmory Oxford1001020
Vanderbilt AGeorgia Tech D100010
South Carolina BVanderbilt B100010