科学网-暗物质理论出了问题？-刘进平的博文

暗物质理论出了问题？

2016-9-8 17:54

阅读：2365

Something is wrong with dark matter

http://edition.cnn.com/2016/09/07/opinions/dark-matter-analysis-lincoln/

Science

Dr. Don Lincoln is a senior physicist at Fermilab and does research using the Large Hadron Collider. He has written numerous books and produces a series of science education videos. He is the author of "The Large Hadron Collider: The Extraordinary Story of the Higgs Boson and Other Things That Will Blow Your Mind." Follow him on Facebook. The opinions expressed in this commentary are solely those of the author. (CNN)Nearly a mile under the Black Hills of South Dakota sits a canister of the atomic element xenon, chilled cold enough to turn it to liquid. The canister is the Large Underground Xenon, or LUX, detector -- the most sensitive dark matter detector in the world. But the results of a new

CNN

Science

Dark matter clumps may have punched through star stream

A one-two punch of dark matter may have knocked holes in a stream of stars out past the edge of the Milky Way. If confirmed, these would be the smallest clumps of dark matter we have ever detected. “Potentially, this stream could allow us to probe for the first time how dark matter behaves on a small scale,” says Sergey Koposov at the University of Cambridge. Dark matter is an all-pervasive yet invisible substance responsible for much of the large-scale structure of the universe. We can see its powerful gravitational effects at work, but have never seen it directly and we are still uncertain as to its exact nature. The Milky Way, which is about 100,000 light years across, is thought to sit within

New Scientist

Science

Scientists have made a major discovery about the most important dwarf planet you’ve never heard of

One of the Earth’s closest neighbors has just gotten a bit more interesting. In a series of new studies, scientists analyzing data from NASA’s Dawn mission report that Ceres, a dwarf planet floating in the asteroid belt, remains geologically active-with evidence of an active ice volcano, frozen water on the surface, and a variety of…

Quartz

Science

If SETI's Signal Is A Sign Of Intelligent Life, We Can Probably Expect These Changes On Earth

How would SETI discovering a signal from intelligent life change the day to day life for the average person? originally appeared on Quora: the knowledge sharing network where compelling questions are answered by people with unique insights. Answer by John L. Miller, Computer Science PhD, on Quora: I don’t think the average person’s life would change significantly with the knowledge that there is intelligent life. In my optimistic youth, I imagined knowledge of other life in the universe as a unifying force, pushing us all forward. Now that I’m older, I realize that it wouldn’t necessarily unify us if there was any advantage to be gained by monopolizing contact. Nor would it necessarily be good

Forbes

Science

Ask Ethan: How Do We Know The Universe Is 13.8 Billion Years Old?

You’ve heard the story before: the Universe began with the Big Bang 13.8 billion years ago, and formed atoms, stars, galaxies, and eventually planets with the right ingredients for life. Looking at distant locations in the Universe is also looking back in time, and somehow, through the power of physics and astronomy, we’ve figured out not only how the Universe began, but its age. But how do we know how old the Universe is? That what Thys Hauptfleisch wants to know for this week’s Ask Ethan: Ethan, how was the 13.8 billion years calculated? (In English please!) There are actually two different, independent methods we have to measure this number, and while one is far more accurate to the other,

Forbes

Science

Science just found a "ghost galaxy" and it sounds incredibly cool

Scientists have found a “ghost galaxy” that is 99.99% made up of dark matter. It’s located inside of the Coma galaxy and has probably already spawned hundreds of new sci-fi scripts being sent to the desks of Hollywood producers’ assistants. Its discovery is another win for the scientific community, which has identified the ghost galaxy’s location even though dark matter doesn’t reflect light and can’t be seen. Little information is available about dark matter, which is what makes this discovery so amazing! All we really know is that our universe is made up of 27% dark matter, yet we can only tell it exists through calculations. It’s not something that can be observed. Scientists saw that the

HelloGiggles

Science

Are We The Earliest Intelligent Life In The Universe?

The study of the formation and logic of the universe - cosmology - and the study of exoplanets and their conduciveness to life do not seem to intersect much. Scientists in one field focus on the deep physics of the cosmos, while the others search for the billions upon billions of planets out there - and seek to unlock their secrets. But astrophysicist and cosmologist Avi Loeb, a prolific writer about the early universe from his position at the Harvard-Smithsonian Center for Astrophysics, sees the two fields of study as inherently connected and has set out to be a bridge between them. A result of his efforts is a theoretical paper that seeks to place the rise of life on Earth, and perhaps elsewhere,

NPR.Org

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