Resumen de Too Cold for Comfort.
This article explores the effect of dark matter and dark energy on cosmic expansion. When you first meet dark energy, it seems so charming. Cosmic expansion has got its groove back: once thought to be winding down, it is actually speeding up. But astronomers have come to realize that dark energy has a dark side. The cold grip of its repulsive gravity is strangling the formation of large cosmic structures. And now observers see it prowling the neighborhood of our own Milky Way. Early efforts by Allan R. Sandage of the Carnegie Observatories in Pasadena, Calif., and others in the 1970s, confirmed in recent years, hinted that stuff is moving abnormally slowly--on average, somewhere around 75 kilometers per second. Simulations predict that galaxies, pulled together by gravity, should buzz around at closer to 500 kilometers per second. One explanation, championed by Igor Karachentsev of the Russian Academy of Sciences, is that galaxies and their individual cocoons of dark matter swim in a sea of dark matter. INSET: WRONG WAY.
