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Science 24 March 2000:
Vol. 287. no. 5461, pp. 2171 - 2172
DOI: 10.1126/science.287.5461.2171
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Perspectives

ASTRONOMY:
How Flat Is the Universe?

Elena Pierpaoli, Douglas Scott, Martin White

Since its discovery in 1965, the cosmic microwave background (CMB) has been measured at higher and higher resolution. In this Perspective, Pierpaoli et al. combine all existing observational data sets to derive the characteristic temperature variations in the CMB as a function of angular scale. The results have profound implications for the origin of structure in the universe and the global curvature of space.

E. Pierpaoli and D. Scott are at the Department of Physics and Astronomy, University of British Columbia, British Columbia V6T 1Z1, Canada. E-mail: elena{at}astro.ubc.ca and dscott{at}astro.ubc.ca M. White is at the Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA. E-mail: mwhite{at}cfa.harvard.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)