By looking at clusters of distant galaxies, astronomers have probed how the imprint of sound waves (white circle) serves as a sort of cosmic ruler through time. At left are galaxies as they appeared 3.8 billion years ago; at center, 5.5 billion years ago; and at right, 13.7 billion years ago soon after the Big Bang.
Credit: E.M. Huff; SDSS-III; South Pole Telescope. Graphic by Zosia Rostomian.
Eruption early in human prehistory may have been more whimper than bang
Greed may breed financial fitness, but evolution allows unselfishness to survive
Fine-tuning of technique used in other animals could enable personalized medicine
Simulation suggests long-term effect on sea level not as dire as some predictions
Coverage of the 2013 American Association for the Advancement of Science meeting
The Year in Science 2012
Three-part series on the scientific struggle to explain the conscious self
Tables of contents, columns and FAQs on SN Prime for iPad