News tagged with gravity

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Quantum causal relations: A causes B causes A

A deeply rooted concept in everyday life is causality; the idea that events in the present are caused by events in the past and, in turn, act as causes for what happens in the future. Physicists from the ...

Oct 02, 2012
4 / 5 (26) 55 | with audio podcast

A black hole unmasked

Black holes are among the most amazing and bizarre predictions of Einstein's theory of gravity. A black hole is thought to be point-like in dimension, but it is surrounded by an imaginary surface, or "edge," ...

Nov 29, 2011
4.7 / 5 (19) 26 | with audio podcast

Heliophysics nugget: Riding the plasma wave

Throughout the universe more than 99 percent of matter looks nothing like what's on Earth. Instead of materials we can touch and see, instead of motions we intuitively expect like a ball rolling down a hill, ...

Jul 18, 2012
4.9 / 5 (18) 2 | with audio podcast

Is dark energy static or dynamic?

(Phys.org)—While hypothesized dark energy can explain observations of the universe expanding at an accelerating rate, the specific properties of dark energy are still an enigma. Scientists think that dark energy could take ...

Nov 12, 2012 feature
4.5 / 5 (19) 48 | with audio podcast

Mapping the road to quantum gravity

The road uniting quantum field theory and general relativity – the two great theories of modern physics – has been impassable for 80 years. Could a tool from condensed matter physics finally help map ...

Apr 23, 2014
4.4 / 5 (19) 11