690958main_p1237a1.jpg

The accelerating expansion of the galaxies observed in the Hubble Ultra Deep Field may conform more to Albert Einstein’s “cosmological constant” than a popular alternative theory of dark energy. (Credit: NASA; ESA; G. Illingworth, D. Magee, and P. Oesch, University of California, Santa Cruz; R. Bouwens, Leiden University; and the HUDF09 Team) The accelerating expansion of the galaxies observed in the Hubble Ultra Deep Field may conform more to Albert Einstein’s “cosmological constant” than a popular alternative theory of dark energy.