Letters to the Editor

Feedback

By
3:30pm, May 2, 2014

Clocking the universe’s expansion

Conflicting estimates of the Hubble constant — a measure of the speed of the universe’s expansion — have sparked debate among cosmologists. The discrepancy in data from the Planck satellite with data from other methods may be just a mistake, or it may require adjusting the cosmological model of the universe, as Tom Siegfried explained in “Cosmic question mark” (SN: 4/5/14, p. 18).

This article is available only to subscribing members. Join SSP today or Log in.

More from Science News