Purcell

Definition

Purcell is a scientist who made significant contributions to the understanding of interstellar gas. His work includes the discovery of the 21 cm hydrogen line, which is crucial for studying interstellar matter.

5 Must Know Facts For Your Next Test

1. Edward Mills Purcell discovered the 21 cm hydrogen line in 1951.
2. The 21 cm line is emitted by neutral hydrogen atoms in space.
3. Purcell's discovery allows astronomers to map the distribution and movement of hydrogen gas in our galaxy.
4. This emission line falls within the radio spectrum, making it detectable by radio telescopes.
5. Purcell shared the Nobel Prize in Physics in 1952 for his research on magnetic resonance, which relates to his work on interstellar gas.

Review Questions

• What significant discovery did Edward Mills Purcell make that impacts the study of interstellar gas?
• How does the 21 cm hydrogen line help astronomers understand our galaxy?
• In what year was Purcell awarded the Nobel Prize in Physics, and for what contribution?

Related terms

Hydrogen Line: A spectral line that results from changes in energy levels of neutral hydrogen atoms.

Interstellar Medium: The matter that exists in space between star systems, primarily composed of gas and dust.

Radio Telescope: An instrument used to detect radio waves from astronomical objects, essential for observing phenomena like the 21 cm hydrogen line.