A Cleaner Cosmological Ruler Could Shed Light on Dark Energy

A 12-inch ruler isn't much help when you're trying to trying to measure the universe. To handle the enormous distances between planets, stars, galaxies, and groups of galaxies, astronomers have developed a whole set of measuring tools and units of measurement. In an upcoming issue of the American Physical Society's journal Physical Review Letters, a team of scientists is proposing a pristine new tool that could help us unravel the nature of dark energy. This is one slice through a map of the lar...