Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!

 


Forgot your password?
Close
typodupeerror

Comment But of course! (Score 1) 88

What's the point of having a national military if you can't use it to pump taxpayer dollars into corporate coffers?

*scenario*

"Fox company, we'll airdrop a licensed mechanic and a licensed parts salesman onto your position around 0930, as soon as they finish repairing some stuff the enemy captured last year and make their way back to our side of the lines. Division says hold your position as best you can until then -- and remind the riflemen not to use their weapons as clubs, as that will void their warranty. It would be better for the overall war effort to let you position be overrun."

"No, Davies can't fix the autocannon even if your lives depend on it. Division says to shoot him in the arse if he so much as touches it."

Submission + - Be nice - Batman is watching! (sciencealert.com)

Submitted by Black Parrot
Black Parrot writes: From ScienceAlert:

A new study has found that people are more likely to act kind towards others when Batman is present â" and not for the reasons you might assume.
[...]
Psychologists from the Catholic University of the Sacred Heart in Italy conducted experiments on the Milan metro to see who, if anyone, might offer their seat to a pregnant passenger.
The kicker? Sometimes Batman was there â" or at least, another experimenter dressed as him. The researchers were checking if people were more likely to give up their seat in the presence of the caped crusader.
And sure enough, there did seem to be a correlation. In 138 different experiments, somebody offered their seat to an experimenter wearing a hidden prosthetic belly 67.21 percent of the time in the presence of Batman.
That's a lot more often than times the superhero wasn't around â" in those cases, a passenger offered a seat just 37.66 percent of the time.
[...]
"Interestingly, among those who left their spot in the experimental condition, nobody directly associated their gesture with the presence of Batman, and 14 (43.75 percent) reported that they did not see Batman at all."

The article goes on to speculate about what is causing people to be more generous.

Submission + - Another large Black hole in "our" Galaxy (arxiv.org)

Submitted by RockDoctor
RockDoctor writes: A recent paper on ArXiv reports a novel idea about the central regions of "our" galaxy.

Remember the hoopla a few years ago about radio-astronomical observations producing an "image" of our central black hole — or rather, an image of the accretion disc around the black hole — long designated by astronomers as "Sagittarius A*" (or SGR-A*)? If you remember the image published then, one thing should be striking — it's not very symmetrical. If you think about viewing a spinning object, then you'd expect to see something with a "mirror" symmetry plane where we would see the rotation axis (if someone had marked it). If anything, that published image has three bright spots on a fainter ring. And the spots are not even approximately the same brightness.

This paper suggests that the image we see is the result of the light (radio waves) from SGR-A* being "lensed" by another black hole, near (but not quite on) the line of sight between SGR-A* and us. By various modelling approaches, they then refine this idea to a "best-fit" of a black hole with mass around 1000 times the Sun, orbiting between the distance of the closest-observed star to SGR-A* ("S2" — most imaginative name, ever!), and around 10 times that distance. That's far enough to make a strong interaction with "S2" unlikely within the lifetime of S2 before it's accretion onto SGR-A*.)

The region around SGR-A* is crowded. Within 25 parsecs (~80 light years, the distance to Regulus [in the constellation Leo] or Merak [in the Great Bear]) there is around 4 times more mass in several millions of "normal" stars than in the SGR-A* black hole. Finding a large (not "super massive") black hole in such a concentration of matter shouldn't surprise anyone.

This proposed black hole is larger than anything which has been detected by gravitational waves (yet) ; but not immensely larger — only a factor of 15 or so. (The authors also anticipate the "what about these big black holes spiralling together?" question : quote "and the amplitude of gravitational waves generated by the binary black holes is negligible.")

Being so close to SGR-A*, the proposed black hole is likely to be moving rapidly across our line of sight. At the distance of "S2" it's orbital period would be around 26 years (but the "new" black hole is probably further out than than that). Which might be an explanation for some of the variability and "flickering" reported for SGR-A* ever since it's discovery.

As always, more observations are needed. Which, for SGR-A* are frequently being taken, so improving (or ruling out) this explanation should happen fairly quickly. But it's a very interesting, and fun, idea.

Submission + - Surado, formerly Slashdot Japan, is closing at the end of the month. (srad.jp) 1

Submitted by AmiMoJo
AmiMoJo writes: Slashdot Japan was launched on May 28, 2001. On 2025/03/31, it will finally close. Since starting the site separated from the main Slashdot one, and eventually rebranded as "Surado", which was it's Japanese nickname.

Last year the site stopped posting new stories, and was subsequently unable to find a buyer. In a final story announcing the end, many users expressed their sadness and gratitude for all the years of service.

Slashdot Top Deals

Anyone can make an omelet with eggs. The trick is to make one with none.

Close