Monday, January 31, 2011

Oldest Galaxy lacked many Stars


The Hubble Space Telescope has spotted the oldest known galaxy – a mere 480 million years after the Big Bang – and its tiny size may hold clues to how stars formed during the universe's infancy.
The tiny smudge of light captured by the orbiting Hubble telescope took 13.2 thousand million years to reach Earth, which means the galaxy was born some 480 million years after the ‘Big Bang’ that created the cosmos.
Even older galaxies are likely to be out there, but they will only be detected with next-generation sensors aboard the Hubble's successor, they said. "We're getting back very close to the first galaxies, which we think formed around 200 to 300 million years after the Big Bang," said Garth Illingworth, professor of astronomy and astrophysics at the University of California at Santa Cruz.
Galaxy far older than previous record-holder
Astronomers measuring the age of starlight look for something called redshift: the farther that light travels, the longer and ‘redder’ become its wavelength.
A high redshift number thus indicates that the object is old, for the light it emitted has taken billions of years to reach us across the expanding universe.
The new-found galaxy, UDFj-39546824, was found in a fingernail-sized sector of sky called the Hubble Ultra-Deep Field during 87 hours of scans in 2009 and 2010. Its finders calculate the redshift as a whopping 10.3, far older than the previous record for a galaxy of 8.6, announced by an international team last October.
Galaxies underwent a dramatic change
"This result is on the edge of our capabilities, but we spent months doing tests to confirm it, so we now feel pretty confident," Illingworth said. For all its great age, this early galaxy is a tiddler compared to those which came later. Our own Milky Way is 100 times bigger.
The observations also netted three other galaxies with redshifts higher than 8.3. Put together, these discoveries suggest galaxies underwent a dramatic change from about 480 million to 650 million years after the Big Bang. During these 170 million years, the rate of star birth in the early universe increased tenfold. "This is an astonishing increase in such a short period, just 1% of the current age of the universe.

Sunday, January 30, 2011

"What does the Bible say about tattoos / body piercings?"


The Old Testament law commanded the Israelites, “Do not cut your bodies for the dead or put tattoo marks on yourselves. I am the LORD”  So, even though today are not under the Old Testament law  the fact that there was a command against tattoos should raise some questions. The New Testament does not say anything about whether or not a believer should get a tattoo.

In relation to tattoos and body piercings, a good test is to determine whether we can honestly, in good conscience, ask God to bless and use that particular activity for His own good purposes. “So whether you eat or drinThe New Testament does not command against tattoos or body piercings, but it also does not give us any reason to believe God would have us get tattoos or body piercings.

An important scriptural principle on issues the Bible does not specifically address is if there is room for doubt whether it pleases God, then it is breminds us that anything that does not come from faith is sin. We need to remember that our bodies, as well as our souls, have been redeemed and belong to God. Although.  does not directly apply to tattoos or body piercings, it does give us a principle: “Do you not know that your body is a temple of the Holy Spirit, who is in you, whom you have received from God? You are not your own; you were bought at a price. Therefore honor God with your body.” This great truth should have a real bearing on what we do and where we go with our bodies. If our bodies belong to God, we should make sure we have His clear “permission” before we “mark them up” with tattoos or body piercings.
the word tattoo is said to has two major derivations- from
the polynesian word ‘ta’ which means striking something
and the tahitian word ‘tatau’ which means ‘to mark something’.

the history of tattoo began over 5000 years ago and is as
diverse as the people who wear them.

tattoos are created by inserting colored materials beneath
the skins surface. the first tattoos probably were created
by accident. someone had a small wound, and rubbed it
with a hand that was dirty with soot and ashes from the fire.
once the wound had healed, they saw that a mark stayed
permanently.

despite the social sciences' growing fascination with tattooing,
and the immense popularity of tattoos themselves,
the practice has not left much of a historical record.written records, physical remains, and works of art relevant to
egyptian tattoo have virtually been ignored by earlier egyptologists
influenced by prevailing social attitudes toward the medium.
today however, we know that there have been bodies recovered
dating to as early XI dynasty exhibiting the art form of tattoo.
in 1891, archaeologists discovered the mummified remains
of amunet, a priestess of the goddess hathor, at thebes who
lived some time between 2160 BC and 1994 BC.
this female mummy displayed several lines and dots tattooed
about her body - grouping dots and/or dashes were aligned into
abstract geometric patterns. this art form was restricted
to women only, and usually these women were associated
with ritualistic practice.
the egyptians spread the practice of tattooing throughout the world.
the pyramid-building third and fourth dynasties of egypt
developed international nations with crete, greece, persia,
and arabia. by 2,000 BC the art of tattooing had stretched out all the
way to southeast asia .
the ainu (western asian nomads) then brought it with them
as they moved to japan.the greeks learnt tattooing from the persians.
their woman were fascinated by the idea of tattoos as
exotic beauty marks.
the romans adopted tattooing from the greeks.
roman writers such as virgil, seneca, and galenus reported that
many slaves and criminals were tattooed.
a legal inscription from ephesus indicates that during the early
roman empire all slaves exported to asia were tattooed with the
words ‘tax paid’.
greeks and romans also used tattooing as a punishment.
early in the fourth century, when constantine became roman emperor
and rescinded the prohibition on christianity, he also banned tattooing
on face, which was common for convicts, soldiers, and gladiators.
constantine believed that the human face was a representation of the
image of god and should not be disfigured or defiled.


Saturday, January 29, 2011

Astrologers angered by stars

Comments by Professor Brian Cox and Dara O'Briain have led to a petition against 'BBC bias' by the Astrological Association of Great Britain.

Professor Brian Cox and Dara O'Briain have unleashed the wrath of Britain's astrologers with their comments about the ancient art on BBC2's "Stargazing Live" show, with the result that the Astrological Association of  Great Britain have started a petition they plan to send to the BBC.
The section of the program that caused the fuss has been described in truly harrowing terms by 'respected astrologer' Angela Cornish, in an e-mail that was published by the Sky Script blog.
"If you didn't happen to see it, there were two presenters, Professor Brian Cox and Dara O'Briain. All was going well until they got to a part where they had models of the planets in our solar system on a table and Dara was explaining that all of the planets orbit at different speeds and distances away from the Sun. He said only the earth orbits the Sun in 365 days and returns to its own place, showing that horoscopes are nonsense. He then went on to add "Let's get this straight once and for all, Astrology is rubbish" The other presenter, Brian Cox, then agreed and said "in the interests of balance on the BBC, yes astrology is nonsense."
 Shocking stuff, I think you'll agree.
This is not the first time that Brian Cox has waded into the astrology controversy that has raged in science for literally almost none of the last couple of centuries. The hackles of Britain's astrologers were raised last year, when Cox took a moment during his Wonders of the Solar System series to explain to the public  that "astrology is a load of rubbish," a statement which pretty much echoes the scientific consensus on the matter, which says that, "astrology is a load of rubbish." It's a position that was first reached by Islamic Scholars at 650 years ago, and has been studiously ignored by such great minds as Jonathan Cainer ever since.
Since then, TV's most clean-shaven male Professor has become a bit of a lightning rod for astrologically-guided criticism, and The astrological Association of Great Britain’s new petition names him personally.
The Association will be requesting that the BBC make a public apology and a statement that they do not support the personal views of Professor Brian Cox or Dara O'Briains on the subject of astrology. We also request that the BBC will commit to making a fair and balanced representation of astrology when aired in the future.
On the second sentence at least I think we can all agree. I'd love to see the BBC give a fair and balanced representation of astrology. In fact sod it, let's extend that to all newspapers as well.
 The Association will be requesting that the BBC make a public apology and a statement that they do not support the personal views of Professor Brian Cox or Dara O'Briains on the subject of astrology. We also request that the BBC will commit to making a fair and balanced representation of astrology when aired in the future.
Such a representation would depict astrology as a pseudoscience with no real basis in evidence that was already being ridiculed in the dark ages, and note that after thousands of years astrologers still can’t produce statistically meaningful results.
It would observe that any apparent success of astrology probably owe more to the use of cold-reading techniques. Convenient Vaguenese, and the exploitation of Psychological quirks like confirmation bias or the Forer effects, and express amazement at the continued ability of the astrological industry to lift hundreds of millions of euros, pounds and dollars out of the pockets of customers each year.

 Finally, it would make the point that intellectually-speaking, the pursuit of meaningful predictions in astrology isn't so much flogging a dead horse as punching a piece of rock and wondering why it won't say anything. Fair and balanced reporting is not the best thing to ask for when your views have about as much credibility as Andy Coulson's future in journalism.
Anyway, the Association's statement goes on to say that:
"Communications the Association have received show that dissatisfaction is growing with Professor Brian Cox's support for Dara O'Briain's denigration of astrology in his Stargazing Live BBC2 television programme on 3rd January 2011 (see the portion commencing 17'30" and 19'45" into the programme). His justification was fragmentary astronomy and empty of logic. Yet he allowed the total condemnation of astrology. This is particularly disappointing, because for the previous nine months the Association had explained carefully to the BBC the reasons why Professor Cox's understanding of astrology was unreliable; following his gratuitous and unsubstantiated dismissal of it in Wonders of the Solar System."

Wednesday, January 26, 2011

Most Comets May be from other Solar Systems

The outer Solar System is full of comets from other planetary systems, say researchers, and this has implications for astronomers trying to explain the nature of these lonely interstellar wanderers.
The findings of a study led by planetary scientist Hal Levison, from the Southwest Research Institute in Boulder, Colorado, imply that some famous comets such as Halley, Hale-Bopp and McNaught might have originated around other stars in the early days of the Sun.
“People who study the chemical composition of comets have been trying to fit what they see into what they think was chemically happening in the proto-planetary disc around the Sun,” said Levison.
Not so lonely in space after all
“What we’re saying is: take a step back, because not all these guys may be from our Solar System.”
Most comets come from the Oort Cloud, a population of more than 400 billion comets lying nearly one light-year away - or roughly eight trillion kilometres from the Sun. This is equivalent to 50,000 times the distance between the Earth and the Sun and about a quarter of the way to Proxima Centauri, the nearest star.
It has long been thought comets in the Oort Cloud were originally part of the rocky debris surrounding Jupiter and Saturn, and were kicked into their present orbits by the gravity of the outer planets and nearby stars.
90% from another solar system
But traditional models have been unable to explain the abundance of comets in the Oort cloud, under-estimating their number by a factor of about 70.
“What we were interested in trying to explain was the large number of objects that we see in the Oort cloud today,” said Levinson.
“We calculate that number by looking at the number of what we call long period comets – these are some of the most famous and brightest comets in history.”
The study, published today in Sciencexpress, the online early edition of the journal Science, shows it is possible more than 90% of comets in the Oort Cloud were captured from other stars when the Sun spread apart from its ‘birth cluster’.
The Sun has sisters
Levinson said it is common for stars to be born in ‘clusters’, fed by a large cloud of gas held together by its own gravity. Around each of these stars will form comets, many of which will be stripped from the star by the gravity of the cluster.
When some of the stars grow old enough, they emit strong stellar winds that literally blow the gas from the cluster, destroying its gravitational hold on the stars. Once this occurs the cluster starts to disperse, and if a star leaves the cluster at the same velocity as a comet from another star, the comet can be captured.
Trillions of comets on average originally form around each star, and the study’s computer simulations show up to a quarter of this average can end up in an Oort Cloud.
Plenty of comets for everybody
The fact the Sun stole so many comets doesn’t mean other stars missed out on the chance to have an Oort Cloud of their own. “It’s not a zero sum game,” said Levison, and noted for all of the comets captured by stars when the cluster dispersed, there are many times more floating around in inter-stellar space.
Astronomer Simon O’Toole from the Anglo-Australian Observatory in Sydney said it is not a complete surprise the Oort Cloud contains comets from other solar systems, but the very large proportion of 'foreigners' estimated by the study was surprising.
“It’s a very intriguing result and an interesting idea, one that was actually suggested a while ago,” he said. “The great thing about the tremendous advances in computing power is that you can do calculations (like this) that you just couldn’t do, even 20 years ago.”

Tuesday, January 25, 2011

Can we feel the future through psi?

A storm is hovering over the editors of the  Journal Personality & Social Psychology which is to publish a paper offering evidence for precognition – knowledge of unpredictable future events Feeling the Future, written by Daryl Bem, an emeritus professor of Cornell University, reports the results of nine experiments with more than 1,000 subjects, all but one of which appear to suggest paranormal powers. His findings are due to be published by the respected journal this year, and sceptics have been queueing up to rubbish them.
Among Bem's contentions is that participants given a memory test were more likely to remember words that they were later asked to practise, suggesting that the effects of this post-test rehearsal somehow reached back in time. He also found that subjects asked to select which of two curtains on a computer screen hid an erotic image were able to do so at a significantly greater rate than chance would predict. Intriguingly, the same experiment didn't produce any unusual results when the images behind the virtual curtain were less titillating.
The study is striking not so much for its data – anomalous results from smallish one-off experiments can hardly be described as earth-shattering – but for the fact that it comes from such a distinguished source (Bem is a highly acclaimed research psychologist), and because it has been accepted by such a prominent publication, following the usual peer review procedures. But perhaps even more interesting is the reaction it is producing among some critics – Ray Hyman, another emeritus psychology professor has described the publication as "Pure craziness …an embarassment of Future life ", while Robert Park, a physicist at the University of Maryland called it. “a waste of time…it leads the public off into strange directions that will be unproductive”
The strength of such denunciations are curious. If Bem's experiments are indicative of ESP, then the implications are fascinating and wide-ranging, and at least worthy of continued investigation. Indeed, part of Bem's motivation, he says, was to construct easily replicable trial procedures so that interested parties could help build a reliable evidence base. If his trials are flawed, then they should be challenged robustly in the public domain.
Leaps in understanding require daring as well as rigour, and while extraordinary claims may require extraordinary evidence, there does seem to be sufficient data for ESP to at least merit an ongoing debate. Dean Radin's book  The Noetic Universe offers reams of serious studies purporting to show phenomena such as perception at a distance, mind-matter interaction and telepathy – including meta-analyses of apparently well-conducted trials – that appear to add up to something interesting. Radin also suggests that theories underpinning psychic phenomena are no weirder – and indeed potentially compatible with – those regularly put forward and accepted in mainstream physics, or in mind-body medicine.
To the interested observer, the wide divergence of views among psi experts can be as befuddling as the evidence itself. When the people who have devoted their careers either to proposing or debunking the existence of the paranormal can't agree on the fundamentals of their field, even when presented with the same data, then what chance does the lay observer have? The arguments tend to stand or fall on the finer points of study design or statistical interpretation. One of the main critiques of Bem's study is not that his results are suspect, but that he has analysed them insufficiently, although it's worth noting that one of the sceptic re-analyses concludes that his data offers a “Surprising degree of evidence” in favour of precognition.
But perhaps the most telling statistic in Bem's paper is that 34% of psychologists consider psychic phenomena to be impossible. Improbable, maybe. Unproven, perhaps. But impossible? That certainty seems to reflect a clinging to orthodoxy that is as much belief-based as the public's conviction that psychic powers are real and in our possession (apparently, 62% of us claim to know who’s calling before we pick up the phone).
Daryl Bem's experiments may or may not give us evidence that precognition exists – but if publication of his paper can show that interest in psychic phenomena isn't limited to crackpot true believers, and that studies of it are worthy of more than blind dismissal or uncritical acceptance, then it will have more than served a purpose.

Monday, January 24, 2011

The Bermuda Triangle

The Bermuda Triangle (also known as Devil's Triangle and Devil's Sea) is a nearly half-million square-mile (1.2 million km2) area of ocean roughly defined by Bermuda, Puerto Rico, and the southernmost tip of Florida. This area is noted for a high incidence of unexplined losses of ships, small boats, and aircraft.
While there is a common belief that a number of ships and airplanes have disappeared under highly unusual circumstances in this region, the United States Coast Guard and others disagree with that assessment, citing statistics demonstrating that the number of incidents involving lost ships and aircraft is no larger than that of any other heavily traveled region Many of the alleged mysteries have proven not so mysterious or unusual upon close examination, with inaccuracies and misinformation about the cases often circulating and recirculating over the decades.
The triangle is an arbitrary shape, crudely marking out a corridor of the Atlantic, stretching northward from the West Indies, along the North American seaboard, as far as the Carolinas. In the Age of Sail, ships returning to Europe from parts south would sail north to the Carolinas, then turn east for Europe, taking advantage of the prevailing wind direction across the North Atlantic. Even with the development of steam and internal-combustion engines, a great deal more shipping traffic was (and still is) found nearer the US coastline than towards the empty centre of the Atlantic. The Triangle also loosely conforms with the course of the Gulf Stream as it leaves the West Indies, and has always been an area of volatile weather. The combination of distinctly heavy maritime traffic and tempestuous weather meant that a certain, also distinctly large, number of vessels would flounder in storms.
Given the historical limitations of communications technology, most of those ships that sank without survivors would disappear without a trace. The advent of wireless communications, radar, and satellite navigation meant that the unexplained disappearances largely ceased at some point in the 20th Century. The occasional vessel still sinks, but rarely without a trace. It should be noted that both the concept and the name of the Bermuda Triangle date only to the 1960s, and were the products of an American journalist.
Other areas often purported to possess unusual characteristics are the Devil's Sea, located near Japan, and the Marysburgh Vortex or the Great Lakes Triangle, located in eastern Lake Ontario. The Bermuda Triangle (a.k.a. the Devil's Triangle) is a triangular area in the Atlantic Ocean bounded roughly at its points by Miami, Bermuda, and Puerto Rico. Legend has it that many people, ships and planes have mysteriously vanished in this area. How many have mysteriously disappeared depends on who is doing the locating and the counting. The size of the triangle varies from 500,000 square miles to three times that size, depending on the imagination of the author. (Some include the Azores, the Gulf of Mexico, and the West Indies in the "triangle.") Some trace the mystery back to the time of Columbus. Even so, estimates range from about 200 to no more than 1,000 incidents in the past 500 years. Howard Rosenberg claims that in 1973 the U.S. Coast Guard answered more than 8,000 distress calls in the area and that more than 50 ships and 20 planes have gone down in the Bermuda Triangle within the last century.
Many theories have been given to explain the extraordinary mystery of these missing ships and planes. Evil extraterrestrials, residue crystals from Atlantis, evil humans with anti-gravity devices or other weird technologies, and vile vortices from the fourth dimension are favorites among fantasy writers. Strange magnetic fields and oceanic flatulence (methane gas from the bottom of the ocean) are favorites among the technically-minded. Weather (thunderstorms, hurricanes, tsunamis, earthquakes, high waves, currents, etc.) bad luck, pirates, explosive cargoes, incompetent navigators, and other natural and human causes are favorites among skeptical investigators.
There are some skeptics who argue that the facts do not support the legend, that there is no mystery to be solved, and nothing that needs explaining.The number of wrecks in this area is not extraordinary, given its size, location and the amount of traffic it receives. Many of the ships and planes that have been identified as having disappeared mysteriously in the Bermuda Triangle were not in the Bermuda Triangle at all. Investigations to date have not produced scientific evidence of any unusual phenomena involved in the disappearances. Thus, any explanation, including so-called scientific ones in terms of methane gas being released from the ocean floor, magnetic disturbances, etc., are not needed. The real mystery is how the Bermuda Triangle became a mystery at all.
The modern legend of the Bermuda Triangle began soon after five Navy planes [Flight 19] vanished on a training mission during a severe storm in 1945. The most logical theory as to why they vanished is that lead pilot Lt. Charles Taylor’s compass failed. The trainees' planes were not equipped with working navigational instruments. The group was disoriented and simply, though tragically, ran out of fuel. No mysterious forces were likely to have been involved other than the mysterious force of gravity on planes with no fuel. It is true that one of the rescue planes blew up shortly after take-off, but this was likely due to a faulty gas tank rather than to any mysterious forces.
 

Sunday, January 23, 2011

Invisible force

At the South Pole, the harshest environment on Earth, astronomers try to unravel the mystery of dark matter, a force greater than gravity that will determine the fate of the cosmos.
For thousands of years our species has studied the night sky and wondered if anything else is out there. In 2009, we celebrated the 400th anniversary of Galileo’s answer: Yes. Galileo trained a new instrument, the telescope, on the heavens and saw what no other person had seen before: hundreds of extra stars, mountains on the Moon, satellites of Jupiter.
Since then, we have found more than 400 planets around other stars, 100 billion stars in our galaxy, over 100 billion galaxies beyond our own, even the faint radiation that is the echo of the Big Bang.
"Now scientists think that even this extravagant census of the universe might be as out-of-date as the five-planet cosmos that Galileo inherited from the ancients. Astronomers have compiled evidence that what we’ve always thought of as the actual universe – me, you, this magazine, planets, stars, galaxies, all the matter in space – represents a mere 4% of what’s actually out there.
The rest they call, for want of a better word, dark: 23% is something they call dark matter, and 73% is something even more mysterious, which they call dark energy.
“We have a complete inventory of the universe,” Sean Carroll, a California Institute of Technology cosmologist, has said, “and it makes no sense.”
Scientists have some ideas about what dark matter might be – exotic and still hypothetical particles – but they have hardly a clue about dark energy. In 2003, the U.S. National Research Council listed “What Is the Nature of Dark Energy?” as one of the most pressing scientific problems of the coming decades.
The head of the committee that wrote the report, University of Chicago cosmologist Michael S Turner, goes further and ranks dark energy as “the most profound mystery in all of science.”
The effort to solve it has mobilised a generation of astronomers in a rethinking of physics and cosmology to rival and perhaps surpass the revolution Galileo inaugurated on an autumn evening in Padua. They are coming to terms with a deep irony: it is sight itself that has blinded us to nearly the entire universe.