Ligo

Ripples in Space-Time Could Reveal ‘Strange Stars’

By Charles Q. Choi

By looking for ripples in the fabric of space-time, scientists could soon detect “strange stars” — objects made of stuff radically different from the particles that make up ordinary matter, researchers say.

The protons and neutrons that make up the nuclei of atoms are made of more basic particles known as quarks. There are six types, or “flavors,” of quarks: up, down, top, bottom, charm and strange. Each proton or neutron is made of three quarks: Each proton is composed of two up quarks and one down quark, and each neutron is made of two down quarks and one up quark.

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An important milestone for Advanced  Laser Gravitational Wave Observatories (Advanced LIGO) today. News about the event and its forthcoming search for gravitational waves make this a significant moment in astrophysics.

“This is an exciting time that is quite similar to when the astronomy community introduced radio astronomy,” said Denise Caldwell, NSF division director for physics. “In much the same way that radio astronomy added another dimension to how scientists could observe celestial phenomena, Advanced LIGO also offers yet another, different perspective. We have found that each time we open a new window of observation, we are able to make discoveries that lead us to a new frontier.”

Force Needed to Measure Gravitational Waves Detected for 1st Time –“Small as One Thousandth the Diameter of a Proton”

If you want to confirm the existence of gravitational waves, space-time ripples predicted by Albert Einstein in his theory of general relativity, or want to determine to what extent the law of gravity on the macroscopic scale, as described by Sir Isaac Newton, continues to apply at the microscopic scale, you need to detect and measure forces and motions that are almost incomprehensively tiny. For example, at the Laser Interferometer Gravitational-Wave Observatory (LIGO), scientists are attempting to record motions as small as one thousandth the diameter of a proton.

This week, what is believed to be the smallest force ever measured has been detected by researchers with the Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California (UC) Berkeley. Using a combination of lasers and a unique optical trapping system that provides a cloud of ultracold atoms, the researchers measured a force of approximately 42 yoctonewtons. A yoctonewton is one septillionth of a newton and there are approximately 3 x 1023 yoctonewtons in one ounce of force.

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Katamaran > Pagligo.

Ito ang hirap kapag malamig, ang hirap maligo. Tipong gusto mo maligo pero tinatamad ka dahil nga sa malamig ang panahon, parang gusto mo na lang laging nakatutok sa computer.

Hindi ka rin makaligo agad kasi babad yung mata mo dito, ano pa ang mangyayari sayo? Kapag walang pasok huwag na lang maligo, wala namang aamoy at nasa kwarto ka lang naman, pero syempre biro lang yun dahil dapat lagi tayong naliligo at personal hygiene natin yun.

Kaya siguro mabaho ang ibang tao sa ibang bansa, dahil hindi nila naiisip maligo, tulad ng mga nakikita natin sa pelikula pag gising nila diretso bihis na agad sila.

Buti kahit papano mainit sa pinas, takot tayong mamaho. 

There’s More Than One Way To Hunt For Gravitational Waves

By Jennifer Ouellette

This is Part 1 of a two-part feature on the search for gravitational waves. Read Part 2 here.

Physicists are poised to make the first-ever direct detection of gravitational waves. Will the detection come from a big-budget experiment already a decade deep into the search? Or will one of a handful of dark-horse experiments win an upset? 

When Albert Einstein published his general theory of relativity in 1916, he revolutionized physics and reenvisioned the nature of spacetime and gravity: he showed that spacetime was dynamic, not static, and reimagined gravity as the bending and warping of spacetime by massive objects. He also made the startling prediction that gravity travels in waves. Just as objects moving through water cause waves to ripple outward, objects moving through space should produce ripples in spacetime. The more massive the object, the more it will churn the surrounding spacetime, and the stronger the gravitational waves it should produce.

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Se sinto saudades da tua voz, ligo o rádio para escutá-la. Se sinto falta do teu sorriso, vejo fotos e logo passa — ou ameniza. Se tenho vontade de admirar teu jeito bobo e engraçado, vejo alguns vídeos e meu coração acalma. Mas o que fazer quando tudo que mais preciso é o teu abraço?

LIGO Lasers Could Help Reveal Aftermath of Black Hole Crashes

A powerful scientific tool set to come online in 2015 could help scientists spot gravitational waves: ripples in space-time born from violent cosmic crashes light-years from Earth.

The instrument, called LIGO (short for Laser Interferometer Gravitational-Wave Observatories), uses lasers to hunt for the gravitational aftermath created by two massive objects — like a neutron star and a black hole — colliding. Scientists theorize that, like a rock dropping into a pool of water, the fabric of space and time can ripple, sending out these gravitational waves across the universe at the speed of light. Understanding those waves could help scientists learn more about black holes.

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