Eventually BOSS will have cataloged over a million galaxies. These are just the initial results, based on less than a quarter of the expected data that will be amassed by the time the survey ends in 2014, at which point the European Space Agency's Euclid mission will take over, launching in 2019.
While BOSS's findings are consistent with the cosmological constant model for dark energy, so far it's based on limited data. "The cosmological constant may be the simplest explanation," David Schlegel, a member of BOSS at the Lawrence Berkeley National Laboratory, has said. "But we're just beginning to explore the times when dark energy turned on. If there are surprises lurking there, we expect to find them."
Image Credits: (top) Graphic: Zosia Rostomian. Images from Eric Huff, the SDSS team, and the South pole Telescope team. (middle) Don Lang, Apache Point Observatory. (bottom) The 2.5m Sloan telescope at Apache Point Observatory, courtesy SDSS.