Closing in on cosmic expansion

Article Abstract:

Recent data and calculations on type Ia supernovae may lead to the first general consensus on the expansion rate of the universe. Ia's promise as a standard candle, with a constant, calculable absolute brightness, allows the calculation of the distance of galaxies and a value for the Hubble constant.

Measurement, Supernovae, Supernovas, Expanding universe, Astronomical constants

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The dial-up sky

Article Abstract:

Astronomers hope that the wealth of data from the latest astronomical surveys can be made available through links to one World Wide Web site, providing a dial-up sky service for researchers. The project will require a common search engine that can access each individual survey.

Planning, Astronomy, Web sites (World Wide Web), Information services, Web sites

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The life history of galaxy clusters

Article Abstract:

A team led by James Gunn tallied an unexpectedly high number of distant galaxy clusters, threatening a tenet of the Big Bang theory which holds that expansion of the universe will slow or reverse. Their calculated density of the universe suggests that it will keep expanding.

Research, Galaxies, Cosmology, Galaxy clusters

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