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Astronomers have found the most distant Type 1a supernova, a kind of star explosion that should help scientists better understand the ever-expanding universe and the nature of dark energy, the strange force accelerating that expansion. [More]

Missed the illuminating talk on dark energy? Uncertain about certainty

(PhysOrg.com) -- In 1998, scientists discovered that the Universe is expanding at an accelerating rate. Currently, the most widely accepted explanation for this observation is the presence of an unidentified dark energy, although several other possibilities have been proposed. One of these alternatives is that some kind of repulsive gravity – or antigravity – is pushing the Universe apart