Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999amjph..67..665c&link_type=abstract
American Journal of Physics, Volume 67, Issue 8, pp. 665-669 (1999).
Physics
1
Laboratory Experiments And Apparatus, Observational Cosmology, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies
Scientific paper
It is now practical for undergraduate students to carry out a laboratory exercise in which they determine an approximate age for the universe using their own data. Because of the wide availability and excellent performance of charge-coupled device cameras designed for astronomy, a relatively small telescope with a modest spectrograph is sufficient to carry out the necessary observations. The age determination rests on a measurement of the Hubble constant, which, in this experiment, is derived from the measured distance and velocity of recession of a single galaxy. The distance is determined from an image of the galaxy, while the velocity is obtained from a measurement of the redshift of the spectrum of the galaxy. Examples of such observations made at a small college observatory are presented and the extraction of an estimate of the age of the universe from those data is described.
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