jul 202013
 
Link Between Stars' Ages and Their Orbits in Dense Cluster

  Astronomers using NASA’s Hubble Space Telescope have for the first time linked two distinct populations of stars in an ancient globular star cluster to their unique orbital dynamics, offering proof that the stars do not share the same birth date. The globular cluster 47 Tucanae. Image Credit & Copyright: Michael Sidonio (http://www.pbase.com/strongmanmike2002) The analysis of the [continue reading]

okt 202012
 
A Surprising Trend in Galaxy Evolution Uncovered (with Videos)

  A comprehensive study of hundreds of galaxies observed by the Keck telescopes in Hawaii and NASA’s Hubble Space Telescope has revealed an unexpected pattern of change that extends back 8 billion years, or more than half the age of the Universe. This plot shows the fractions of settled disk galaxies in four time spans, [continue reading]

jul 232012
 
Unexpectedly Slow Motions Below the Sun's Surface

  New observations of seismic oscillations on the Sun’s surface from NASA’s SDO mission challenge our understanding of interior solar dynamics. Pattern of convection at the surface of the Sun observed by the SDO/HMI instrument. Credit: MPS/NASA The interior motions of the Sun are much slower than predicted. Rather than moving at the speed of [continue reading]