Ewen
from class: Intro to Astronomy Definition Ewen is often associated with Edward Mills Purcell, who alongside Harold Ewen, discovered the 21 cm hydrogen line. This discovery marked a significant advancement in radio astronomy, helping astronomers study interstellar gas.
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Predict what's on your test 5 Must Know Facts For Your Next Test The 21 cm hydrogen line was first detected by Harold Ewen and Edward Mills Purcell in 1951. This discovery provided direct evidence of the distribution of hydrogen gas in our galaxy. The 21 cm line corresponds to the radio wave emitted by neutral hydrogen atoms. It allows astronomers to map spiral arms and other structures within galaxies. The detection of the 21 cm line opened up new methods for measuring galactic rotation curves. Review Questions Who were the two scientists responsible for discovering the 21 cm hydrogen line? What is the significance of the 21 cm hydrogen line in studying interstellar gas? How has the discovery of the 21 cm hydrogen line contributed to our understanding of galactic structures?
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