News tagged with megaparsec

Hubble rules out one alternative to dark energy

(PhysOrg.com) -- Astronomers using NASA's Hubble Space Telescope have ruled out an alternate theory on the nature of dark energy after recalculating the expansion rate of the universe to unprecedented accuracy.

Mar 14, 2011
4.6 / 5 (25) 92 | with audio podcast

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New supernova likely arose from massive Wolf-Rayet star

They've been identified as possible causes for supernovae for a while, but until now, there was a lack of evidence linking massive Wolf-Rayet stars to these star explosions. A new study was able to find a "likely" link between this star type and a supernova called SN ...

May 22, 2014
4.3 / 5 (9) 20

When dark energy turned on (Update)

(PhysOrg.com) -- Some six billion light years distant, almost halfway from now back to the big bang, the universe was undergoing an elemental change. Held back until then by the mutual gravitational attraction ...

Mar 30, 2012
4.1 / 5 (20) 67 | with audio podcast

In Search of Antimatter Galaxies

NASA's space shuttle program is winding down. With only about half a dozen more flights, shuttle crews will put the finishing touches on the International Space Station (ISS), bringing to an end twelve years ...

Aug 17, 2009
4 / 5 (13) 8

Zeroing in on Hubble's constant

(PhysOrg.com) -- In the early part of the 20th Century, Carnegie astronomer Edwin Hubble discovered that the universe is expanding. The rate of expansion is known as the Hubble constant. Its precise value ...

Jan 05, 2009
4.3 / 5 (12) 0

List of search results for megaparsec