Mapping Dark Energy

Not Penn's memos or Cheney's afternoons, but fascinating nonetheless:

The new image reveals the spectral fingerprints created by dark energy as it stretches huge supervoids and superclusters, structures that are roughly half a billion light-years across. Superclusters are filled with dense clusters of galaxies, while supervoids are made up of mostly empty space. According to the team, there is only a 1-in-200,000 chance that their detection of dark energy's fingerprints happened randomly.