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A Fourth Gravitational Wave Has Been Detected
Astronomers have made a new detection of gravitational waves and for the first time have been able to trace the shape of ripples sent through spacetime when black holes collide. The announcement, made at a meeting of the G7 science ministers in Turin, marks the fourth cataclysmic black-hole merger that astronomers have spotted using Ligo, the Laser Interferometer Gravitational-Wave Observatory. The latest detection is the first to have also been picked up by the Virgo detector, located near Pisa, Italy, providing a new layer of detail on the three dimensional pattern of warping that occurs during some of the most violent and energetic events in the universe.
A tiny wobble in the signal, picked up by Ligo's twin instruments and the Virgo detector on 14 August, could be traced back to the final moments of the merger of two black holes about 1.8 billion years ago. The black holes, with masses about 31 and 25 times the mass of the sun, combined to produce a newly spinning black hole with about 53 times the mass of the sun. The remaining three solar masses were converted into pure energy that spilled out as deformations that spread outwards across spacetime like ripples across a pond. Detecting these tiny distortions has required detectors sensitive enough to measuring a discrepancy of just one thousandth of the diameter of an atomic nucleus across a 4km laser beam.
A paper about the latest discovery has been accepted for publication in the journal Physical Review Letters. |
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| There are no conversations. |
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| Gilbert K. Chesterton |
The object of a New Year is not that we should have a new year. It is that we should have a new soul and a new nose; new feet, a new backbone, new ears, and new eyes. Unless a particular man made New Year resolutions, he would make no resolutions. Unless a man starts afresh about things, he will certainly do nothing effective. |
| Eden Ahbez |
Some white people hate black people, and some white people love black people, some black people hate white people, and some black people love white people. So you see it's not an issue of black and white, it's an issue of Lovers and Haters. |
| Bethany Hamilton |
The day I got back on my board... it was not necessarily hard. I was just so glad to get back in the water, because I'd been anxious for like a week. When I first got up on my first wave, or it was actually my third wave, but I rode it all the way to the beach, and after that, I just had, like, tears of happiness... I was so stoked to be out there. |
| Lucy Hale |
I overanalyze things way too much, to the point where it affects my life. Like, when I'm talking to a boy, I'll overanalyze a text message he sent. And I have to think to myself, 'Just chill out. Some guy sent me a text message. That's all. Don't read something into it that's not there. Just be glad he sent you a text message!' |
| Lapo Elkann |
I've lived in London, Paris, Rio de Janeiro, New York, and Turin. But New York is my favorite city. It has so much energy, so much toughness. |
| Maya Angelou |
My grandmother took me to church on Sunday all day long, every Sunday into the night. Then Monday evening was the missionary meeting. Tuesday evening was usher board meeting. Wednesday evening was prayer meeting. Thursday evening was visit the sick. Friday evening was choir practice. I mean, and at all those gatherings, we sang. |
| Joel Osteen |
I think faith is incredibly important because you will become overwhelmed with what's happening and you will have waves of grief, but when you turn to your faith, I believe God will give you waves of grace to get through it. |
| Jennifer Ehle |
You know what else I've learnt? That it's all right not to ride the crest of the wave. Every time a wave comes along I retreat, and I haven't come to any harm yet. |
| Shawn Fanning |
It's been all over the press, and schools are deciding to shut it down. We released a public announcement saying that we had some potential solutions that we were working with, and once we had something concrete we would start implementing it and approach schools. |
| Pierre de Fermat |
But it is impossible to divide a cube into two cubes, or a fourth power into fourth powers, or generally any power beyond the square into like powers; of this I have found a remarkable demonstration. This margin is too narrow to contain it. |
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Also gravitational time dilation.
This post is a comment.
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There's a hole that takes you to other holes on other planets where evil aliens enslave other humans across the galaxy. Then earth fights them with p90s which are way more effective than laser staffs. It's kind of campy, and has some humor. Then they made Stargate Universe to capitalize on the BSG stuff, so it's super dark (one of the characters gets ALS haha). Season 3 finale of BSG might be the best tv I've ever seen.
This post is a comment.
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China Says It Has Developed a Quantum Radar That Can See Stealth Aircraft
At a recent air show in the city of Zhuhai, state-owned Chinese defense giant China Electronics Technology Group Corporation displayed what it claims to be a quantum radar that's able to detect even the stealthiest of stealth aircraft. The company claims to have been working on the technology for years, and to have tested it for the first time in 2015. In principle, a quantum radar functions like a regular radar -- only that instead of sending out a single beam of electromagnetic energy, it uses two split streams of entangled photons. Only one of these beams is sent out, but due to a quirk of quantum physics both streams will display the same changes, despite being potentially miles apart. As a result, by looking a...
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I had some kinda dream that was a mix of this cooking guy youtube guy, these podcast science guys, and prozd. I wanted to ask them to do some experiments on what the best mac n cheese noodle shape is. Like what is the best shape to carry all the cheese sauce? Does it need to have some structure so you can get a good bite? What are all the relevant factors?
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I think you may be overlooking just how wrong people can be about what interests them. The requirements of my undergrad are what made me even consider trying out computer science in the first place. I would probably be an elementary school teacher by now if it weren't for my lab science requirement. Also, college provides some small form of quality control for the instructors. Not a lot, but certainly more than a decentralized network.
This post is a comment.
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Dream time! This time around I was in a simulation and trying to tell everyone else that it was a simulation. Unfortunately, they weren't real and also this made the simulation angry and try to stop me. Later it turned out that the simulation was actually in my mind and then it sort of turned into a lucid simulation where I could do anything. It was sort of like The Matrix. What a movie - wish they had made a sequel.
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MLK's lesser known landscaping aspirations from his I have a dream speech... "I have a dream today... I have a dream that one day every valley shall be exalted, every hill and mountain shall be made low - the rough places will be made plain, and the crooked places will be made straight."
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Engineers Say They've Created Way To Detect Weapons Using Wi-Fi
The researchers, which include engineers from Rutgers University-New Brunswick, Indiana University-Purdue University Indianapolis (IUPUI), and Binghamton University, published a study this month detailing a method in which common wifi can be used to easily and efficiently identify weapons, bombs, and explosive chemicals in public spaces that don't typically have affordable screening options. The researchers' system uses channel state information (CSI) from run-of-the-mill wifi. It can first identify whether there are dangerous objects in baggage without having to physically rifle through it. It then determines what the material is and what the risk level is. The researchers tested the detection system using 15 different obje...
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Well, I think the feeling and relationships in the dean are more important than the specific symbols. To be clearer, they accepted his commands in the beginning because they wanted his money and they expected him to die soon, but he didn't, so they were stuck doing what he said for waaay longer than expected. That suggests to me that the dream was about some choice I made where I made a concession of my freedom in exchange for something else that I wanted, not expecting to be bound up for such a long time.
This post is a comment.
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he Pentagon Has a Laser That Can Identify People From a Distance By Their Heartbeat
A new device, developed for the Pentagon after U.S. Special Forces requested it, can identify people without seeing their face: instead it detects their unique cardiac signature with an infrared laser. While it works at 200 meters (219 yards), longer distances could be possible with a better laser. "I don't want to say you could do it from space," says Steward Remaly, of the Pentagon's Combatting Terrorism Technical Support Office, "but longer ranges should be possible." Contact infrared sensors are often used to automatically record a patient's pulse. They work by detecting the changes in reflection of infrared light caused by blood flow. By contrast, the new device, called Jetson, uses a technique know...
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