One-Percent Measure Of The Universe Constrains Dark Energy
At the January AAS meeting, researchers from the Baryon Oscillation Spectroscopic Survey (BOSS) announced that they have measured the distance to galaxies more than six billion light years away to an accuracy of one percent. Together with information on the rate at which the Universe was expanding, these measurements allow the scientists at the Max Planck Institute for Extraterrestrial Physics to place powerful constraints on the properties of the mysterious Dark Energy. This component is thought to be responsible for the current accelerated expansion of the Universe.
The new distance measurements were presented at the meeting of the American Astronomical Society by Harvard University astronomer Daniel Eisenstein, the director of SDSS-III. They are detailed in a series of articles submitted by the BOSS collaboration last month and available online. “Determining distance is a fundamental challenge of observational astronomy,” said Eisenstein. “You see something in the sky — how far away is it?”