"Cosmic Speed Measurement Suggests Dark Energy Mystery", by Clara Moskowitz, Scientific American
"Before, there were these hints of tension in the two measurements," says Dan Scolnic of the KICP, a member of Riess' team. "Now both our team and the Planck team have reanalyzed and those hints have become something stronger. We have this alarm bell that there really could be something more going on. This may be the biggest tension now in cosmology."