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Relu Dumitru
Lived in Timisoara, Romania
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Relu Dumitru

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Beautiful American Robin perched on the branch of a crab apple tree in early spring. The American Robins are one of the first birds returning to the northern US in the spring from migration, usually in early March. They can be heard singing their beautiful loud song very early in the morning, long before the sun comes up. They are one of the earliest birds, it's easy to see why they always get the worm!

#spring   #robin   #fineart   #photography  
Birds - American Robin - Nature's Alarm Clock by Christina Rollo
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Toxoplasma, the parasite that will never give me peace! Now comes a paper suggesting that it makes chimpanzees lose their fear of leopards. I write about it in the New York Times today. http://www.nytimes.com/2016/02/16/science/a-parasite-leopards-and-a-primates-fear-and-survival.html
The parasite Toxoplasma gondii may affect the behavior of chimpanzees — and possibly other primates — toward a natural predator, a study finds.
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Gravitational waves have been detected, which is a really big deal. But what causes gravity to produce waves?

Gravitational waves have been directly detected. Why do gravitational waves exist, and why is this such a big discovery?
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"American politics has been captured by terrorists."
Joseph S. Nye discusses the five truths about terrorism in the United States.
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Indian Paradise Flycatcher
Alibag, Maharashtra, India
07 Feb 2016
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Que bello eres.
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#LIGO Detects Gravitational Waves from Merging Black Holes
Illustration Credit: LIGO, NSF, Aurore Simonnet (Sonoma State U.) http://apod.nasa.gov/apod/ap160211.html
A different astronomy and space science related image is featured each day, along with a brief explanation.
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Acclaimed physicist Professor Stephen Hawking says the first observation of gravitational waves is "groundbreaking".
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For the first time, scientists have observed ripples in the fabric of spacetime called gravitational waves, arriving at Earth from a cataclysmic event in the distant universe. This confirms a major prediction of Albert Einstein's 1915 general theory of relativity and opens an unprecedented new window to the cosmos.

Gravitational waves carry information about their dramatic origins and about the nature of gravity that cannot be obtained from elsewhere. Physicists have concluded that the detected gravitational waves were produced during the final fraction of a second of the merger of two black holes to produce a single, more massive spinning black hole. This collision of two black holes had been predicted but never observed.

The gravitational waves were detected on Sept. 14, 2015. Based on the observed signals, LIGO scientists estimate that the black holes for this event were about 29 and 36 times the mass of the sun, and the event took place 1.3 billion years ago. About three times the mass of the sun was converted into gravitational waves in a fraction of a second -- with a peak power output about 50 times that of the whole visible universe. By looking at the time of arrival of the signals -- the detector in Livingston recorded the event 7 milliseconds before the detector in Hanford -- scientists can say that the source was located in the Southern Hemisphere.

According to general relativity, a pair of black holes orbiting around each other lose energy through the emission of gravitational waves, causing them to gradually approach each other over billions of years, and then much more quickly in the final minutes. During the final fraction of a second, the two black holes collide at nearly half the speed of light and form a single more massive black hole, converting a portion of the combined black holes' mass to energy, according to Einstein's formula E=mc2. This energy is emitted as a final strong burst of gravitational waves. These are the gravitational waves that LIGO observed.

Press release:
http://www.nsf.gov/news/news_summ.jsp?cntn_id=137628

#space   #astronomy   #physics  
Scientists say they heard the faint chirp of two black holes colliding a billion light-years away, fulfilling Einstein’s general theory of relativity.
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For the first time, scientists have observed ripples in the fabric of spacetime called gravitational waves, arriving at Earth from a cataclysmic event in the distant universe. This confirms a major prediction of Albert Einstein's 1915 general theory of relativity and opens an unprecedented new window onto the cosmos.
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Gracias es maravilloso
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Skeptic.
Believing that Life is the most improbable thing in the Universe (statistically speaking).
Thats why LIFE is the most valuable thing in the Universe.


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Pe pantă, în jos. Păcat. Cîndva a fost de 5 stele.
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Patru angajați se fîțîie degeaba, un angajat încasează. Coadă ca pe vremuri. A doua casierie - Off. Asta-nseamnă NESIMTIRE (și prostie) cu carul.
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