News tagged with dark energy

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The best way to measure dark energy just got better

(PhysOrg.com) -- Dark energy is a mysterious force that pervades all space, acting as a "push" to accelerate the Universe's expansion. Despite being 70 percent of the Universe, dark energy was only discovered ...

Jan 13, 2011
4.5 / 5 (11) 11 | with audio podcast

Cluster collisions switch on radio halos

(PhysOrg.com) -- This is a composite image of the northern part of the galaxy cluster Abell 1758, located about 3.2 billion light years from Earth, showing the effects of a collision between two smaller galaxy ...

Aug 30, 2010
4.8 / 5 (9) 0 | with audio podcast

Origin of Key Cosmic Explosions Still a Mystery

(PhysOrg.com) -- When a star explodes as a supernova, it shines so brightly that it can be seen from millions of light-years away. One particular supernova variety - Type Ia - brightens and dims so predictably ...

Jul 12, 2010
4.5 / 5 (12) 7 | with audio podcast

Do we need dark matter?

It's the biggest problem in physics: the matter we can see in the universe accounts for just five per cent of the observed gravity that holds galaxies together.

Nov 12, 2009
4.2 / 5 (22) 34

Radio telescopes extend astronomy's best 'yardstick'

Radio astronomers have directly measured the distance to a faraway galaxy, providing a valuable "yardstick" for calibrating large astronomical distances and demonstrating a vital method that could help determine the elusive ...

Jun 08, 2009
4.5 / 5 (11) 2

Celebrating gravity’s light-bending landmark

(PhysOrg.com) -- Today Oxford University scientists are joining in a special celebration of the first test of Albert Einstein’s theory of gravity on the remote African island where the ground-breaking experiment ...

May 29, 2009
3.7 / 5 (7) 1

Cosmology's best standard candles get even better

Members of the international Nearby Supernova Factory (SNfactory), a collaboration among the U.S. Department of Energy's Lawrence Berkeley National Laboratory, a consortium of French laboratories, and Yale ...

May 18, 2009
4.7 / 5 (13) 1