Follow Slashdot stories on Twitter


Forgot your password?
Check out the new SourceForge HTML5 internet speed test! No Flash necessary and runs on all devices. ×

Submission + - The death of dark matter? (

slew writes: A team led by Case Western Reserve University researchers has found a significant new relationship in spiral and irregular galaxies: the acceleration observed in rotation curves tightly correlates with the gravitational acceleration expected from the visible mass only.

This correlation appears to be true of galaxies that would be apparently dominated by "halos" of dark matter in the current standard models which include dark matter to explain the mass/rotational anomalies in such galaxies.

The observations that enabled this result are the infrared measurements by the Spitzer space telescope which are considered more accurate indicators of stellar mass.

Unfortunately this new result does nothing to explain the observation of galactic expansion or apparent dark energy. So it is probably premature to throw in the towel, but hey settled science is too boring ;^)

Submission + - There are four quarks! (

slew writes: Although last year saw the first LHC observations of pentaquark particles, apparently there are indeed tetraquark particles too! And the LHC found four of them (coincidence?) Even more interesting, although they apparently each have a unique internal structure, mass and their own sets of quantum numbers, all of the four particles apparently contain the same quark composition (charm,anti-charm,strange,anti-strange). Weird stuff ;^)

Submission + - Killing two Schrödinger's cats with one stone... (

slew writes: If it wasn't enough that inside a box, you can have a half alive, half dead cat, apparently you can split a quantum mechanical "cat" into two boxes and through the wonders of quantum entanglement, you might be able kill two cats with one stone...

Okay, they didn't use real cats, or boxes (just a microwaves in a resonator cavity), but they performed an actual experiment, not just a thought experiment.

Apparently, this entertaining research might have some actual practical uses for circuit quantum electrodynamics (cQED) in some sort of boring (yawn) quantum computer error correction capacity, someday... But I'm still waiting for the real cat experiment...

Submission + - Death Valley's Sailing Stones Caught in the Act (

Capt.Albatross writes: The flat surface of the Racetrack Playa in Death Valley is littered with rocks, some weighing hundreds of kilograms, each at the end of a track indicating that it has somehow slid across the surface. The mechanism behind this has been the subject of much speculation but little evidence, until a trio of scientists caught them in action with cameras and GPS.

Submission + - M-Carbon: 50yro mystery solved ( 1

slew writes: Unlike its more famous carbon cousins: diamonds and fullerenes, you've probably never heard of M-Carbon, but this form of compressed graphite which is as hard as diamonds has baffled researcher for half a century. Over the past few years, many theoretical computations have suggested at least a dozen different crystal structures for this phase of carbon, but new experiments showed that only one crystal structure fits the data: M-carbon.

Slashdot Top Deals

So... did you ever wonder, do garbagemen take showers before they go to work?