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Related Experiment Videos

Determination of the Hubble constant.

W L Freedman1, L L Feng

  • 1Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA 91101.

Proceedings of the National Academy of Sciences of the United States of America
|September 29, 1999
PubMed
Summary

Astronomers can now measure extragalactic distances with unprecedented accuracy. New techniques and the Hubble Space Telescope have reduced uncertainties to +/-10%, overcoming historical challenges in cosmology.

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Area of Science:

  • Cosmology and extragalactic astronomy.
  • Astronomical distance measurement techniques.

Background:

  • Accurate extragalactic distance determination has been a persistent challenge in astronomy since the 1920s.
  • Historical uncertainties in measuring the Hubble constant (H(0)) were as large as a factor of two.

Purpose of the Study:

  • To summarize recent advancements in extragalactic distance measurement.
  • To highlight the improved precision and agreement achieved in determining cosmic distances.

Main Methods:

  • Development and application of new astronomical detectors and distance measurement techniques.
  • Utilizing advanced instrumentation, including the Hubble Space Telescope.
  • Comparing relative distances to galaxies on a case-by-case basis.

Main Results:

  • Achieved precision in extragalactic distance measurements at the +/-5-20% level.
  • Established quantitative agreement between different distance measurement methods.
  • Reduced the statistical uncertainty in Hubble constant (H(0)) measurements to a few percent.

Conclusions:

  • The historical factor-of-two uncertainty in H(0) has been overcome.
  • Current total uncertainty in H(0) is approaching +/-10%, marking a significant breakthrough.
  • Improved accuracy in extragalactic distances is revolutionizing cosmological studies.

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