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Posts Tagged ‘astronomy’

The Outer Limits: Nasa Probe Sees the ‘Edge’ of Our Solar System for First Time – and it’s Completely Different From What We Thought


Sunday, 13 May 2012

‘Nasa’s probes have seen the ‘edge’ of our solar system for the first time – and it’s completely different from what scientists thought.

Our solar system is flying through space more slowly than we thought – and Nasa’s IBEX – Interstellar Boundary Explorer – has found it doesn’t have a ‘bow shock’, an area of gas or plasma that shields our solar system as it hurtles though space

‘The sonic boom made by a jet breaking the sound barrier is an earthly example of a bow shock,’ says Dr. David McComas, principal investigator of the IBEX mission.’

Read more: The Outer Limits: Nasa Probe Sees the ‘Edge’ of Our Solar System for First Time – and it’s Completely Different From What We Thought

http://www.davidicke.com/headlines/

Little black spot on the sun visible with the naked eye

May 11, 2012 1 comment

Picture of the Day: May 10, 2012
LITTLE BLACK SPOT ON THE SUN TODAY | A sunspot visible with the naked eye at sunrise and sunset, photographed by Stefano DeRosa, via SpaceWeather.
 
 
New monster sunspot 1476 is beautifully active atmSunspot 1476 / Solar Update
Now one of the largest Sunspots in years, Region 1476 is currently in a great position for Earth directed Coronal Mass Ejections. The only problem has been producing a solar flare that would also in turn, generate a large plasma cloud. This could change in the days ahead. There will continue to be a chance for a major X-Class event.

the suns a bubbler today

http://www.youtube.com/watch?feature…&v=OSWcm6We8LU

DISCUSS FURTHER : http://forum.davidicke.com/showthread.php?t=209649

NASA’s Spitzer Sees the Light of Alien ‘Super-Earth’


NASA’s Spitzer Space Telescope was able to detect a super Earth’s direct light for the first time using its sensitive heat-seeking infrared vision. Super Earth’s are more massive than Earth but lighter than gas giants like Neptune. As this artist’s concept shows, in visible light, a planet is lost in the glare of its star (top view). When viewed in infrared, the planet becomes brighter relative to its star. This is largely due to the fact that the planet’s scorching heat blazes with infrared light. Even on our own bodies emanate more infrared light than visible due to our heat. (Credit: NASA/JPL-Caltech)

 

ScienceDaily (May 8, 2012) — NASA’s Spitzer Space Telescope has detected light emanating from a “super-Earth” planet beyond our solar system for the first time. While the planet is not habitable, the detection is a historic step toward the eventual search for signs of life on other planets.

Spitzer has amazed us yet again,” said Bill Danchi, Spitzer program scientist at NASA Headquarters in Washington. “The spacecraft is pioneering the study of atmospheres of distant planets and paving the way for NASA’s upcoming James Webb Space Telescope to apply a similar technique on potentially habitable planets.”

The planet, called 55 Cancri e, falls into a class of planets termed super Earths, which are more massive than our home world but lighter than giant planets like Neptune. The planet is about twice as big and eight times as massive as Earth. It orbits a bright star, called 55 Cancri, in a mere 18 hours.

Read more : http://www.sciencedaily.com/releases/2012/05/120508174416.htm

The Biggest Supermoon in Years is Coming Tonight


Saturday, 05 May 2012 11:28

‘This Saturday evening, take a look at the night sky and you might see something special. The moon will make its largest, most stunning appearance of the year—an event known to scientists as “the perigee-syzygy of the Earth-Moon-Sun system” and to the popular skywatching public simply as the “supermoon.” As one of the most spectacular supermoons in years, the moon will appear 14 percent bigger and 30 percent brighter than when it is on the far side of its orbit.

Why does the moon sometimes appear larger, and sometimes smaller? The answer lies in the fact that its orbit around Earth is elliptical, so its distance from us varies—it ranges from roughly 222,000 to 252,000 miles away each month. On Saturday, the moon will reach what is known as the perigee, coming as close as it ever does to the Earth, just 221,802 miles away. At the same time, it will be a full moon, with the entirety of its Earth-facing surface illuminated by the light of the sun.’

Read more: The Biggest Supermoon in Years is Coming Tonight

http://www.davidicke.com/headlines/

Omnivorous Black Holes Like This One Are Pretty Much the Sharks of Space


By Dan Nosowitz Posted 05.03.2012 at 12:57 pm

Scientists from the Harvard-Smithsonian Center for Astrophysics and Johns Hopkins University report seeing a phenomenon we’ve all imagined: a black hole devouring a star.

A black hole at the center of a galaxy about 2.7 billion light-years away, one about the same size as the black hole at the center of our own Milky Way, was observed sucking the life out of a star.

NASA’s Cassini Finds Saturn’s Moon Phoebe Has Planet-Like Qualities


April 27, 2012 12:58 PM EDT

Phoebe

Saturn’s moon Phoebe(Photo: NASA)

Data from NASA‘s Cassini mission reveal Saturn’s moon Phoebe has more planet-like qualities than previously thought.

Scientists had their first close-up look at Phoebe when Cassini began exploring the Saturn system in 2004. Using data from multiple spacecraft instruments and a computer model of the moon’s chemistry, geophysics and geology, scientists found Phoebe was a so-called planetesimal, or remnant planetary building block. The findings appear in the April issue of the Journal Icarus.

“Unlike primitive bodies such as comets, Phoebe appears to have actively evolved for a time before it stalled out,” said Julie Castillo-Rogez, a planetary scientist at NASA‘s Jet Propulsion Laboratory (JPL) in Pasadena, Calif. “Objects like Phoebe are thought to have condensed very quickly. Hence, they represent building blocks of planets. They give scientists clues about what conditions were like around the time of the birth of giant planets and their moons”

Read more: http://www.scienceworldreport.com/articles/2993/20120427/nasas-cassini-finds-saturns-moon-phoebe-planet.htm

Venus to Appear in Once-In-A-Lifetime Event


ScienceDaily (May 1, 2012)

On 5 and 6 June this year, millions of people around the world will be able to see Venus pass across the face of the Sun in what will be a once-in-a-lifetime experience.

Ultraviolet image of Venus’ clouds as seen by the Pioneer Venus Orbiter (Feb. 26, 1979). (Credit: NASA)

It will take Venus about six hours to complete its transit, appearing as a small black dot on the Sun’s surface, in an event that will not happen again until 2117.

In this month’s Physics World, Jay M Pasachoff, an astronomer at Williams College, Massachusetts, explores the science behind Venus’s transit and gives an account of its fascinating history.

Read full story: http://www.sciencedaily.com/releases/2012/05/120501085556.htm

 

 

MAR. 12: Massive triangle shaped hole in the Sun’s corona recorded by NASA


Don`t know what to say about this, it seems to have happened at the same time with the other solar event, posted here 2 posts back. You can see the other event at 1:20 in the lower left corner and pictures of this huge triangle on the SDO site http://sdo.gsfc.nasa.gov/data/

http://sdo.gsfc.nasa.gov/data/
http://sdo.gsfc.nasa.gov/mission/about.php
http://solen.info/solar/images/AR_CH_20120312.jpg
http://www.swpc.noaa.gov/sxi/goes15/latest.html
http://solen.info/solar/
http://www.disclose.tv/action/viewvideo/37955/Earth_sized_Ufo_s_using_the_sun…

Holometer experiment to test if the universe is a hologram


October 28, 2010 by Lisa Zyga Enlarge
A conceptual design of Fermilab’s holometer. Image credit: symmetry magazine
(PhysOrg.com) — Many ideas in theoretical physics involve extra dimensions, but the possibility that the universe has only two dimensions could also have surprising implications. The idea is that space on the ultra-small Planck scale is two-dimensional, and the third dimension is inextricably linked with time. If this is the case, then our three-dimensional universe is nothing more than a hologram of a two-dimensional universe.

This idea of the holographic universe is not new, but physicists at Fermilab are now designing an experiment to test the idea. Fermilab particle astrophysicist Craig Hogan and others are building a holographic interferometer, or “holometer,” in an attempt to detect the noise inherent in spacetime, which would reveal the ultimate maximum frequency limit imposed by nature.
As Hogan explains in a recent issue of Fermilab’s symmetry magazine, the holometer will be “the most sensitive measurement ever made of spacetime itself.” Hogan and others have already built a one-meter-long prototype of the instrument. They have just begun building the entire 40-meter-long holometer and plan to start collecting data next year.
The holometer consists of two completely separate interferometers positioned on top of one other. In each interferometer, a light beam is split into two different parts that travel in different directions. After bouncing off a mirror, the light beams are brought back together where the difference in their phases is measured. Even the smallest vibration will interfere with the light’s frequency during its travels and cause the two light beams to be out of sync.
While interferometers have been used for more than 100 years, the key to the holometer is achieving extreme precision at high frequencies. The scientists say that the holometer will be seven orders of magnitude more precise than any atomic clock in existence over very short time intervals. By having two interferometers, the researchers can compare them to confirm measurements. In addition, the scientists are making sure that any vibration that is detected isn’t coming from the holometer itself. They will arrange sensors outside the holometer to detect normal vibrations, and then cancel these vibrations by shaking the mirrors at the same frequency.
After taking these precautions, any detected high-frequency noise could be the jitter of spacetime itself, or “holographic noise.” The noise is expected to have a frequency of a million cycles per second, which is a thousand times higher than what the human ear can hear, noted Fermilab experimental physicist Aaron Chou. If the experiment does find this holographic noise, it would be the first glimpse beyond our three-dimensional illusion and into the universe’s true two-dimensional nature at the Planck scale.

http://www.physorg.com/news/2010-10-holometer-universe-hologram.html