July 17th, 2010
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Title: What Were the First Celestial Objects
[podcast]http://traffic.libsyn.com/astro365/20100717-365DoA.mp3[/podcast]
Podcaster: Stuart Clark
Description: Were the first celestial objects giagantic stars or powerful black holes.
Bio: Dr Stuart Clark is an award-winning astronomy author and journalist, buy generic Diflucan. Where can i buy Diflucan online, His books include The Sun Kings, and the highly illustrated Deep Space, japan, craiglist, ebay, overseas, New York. Los Angeles, California, and Galaxy. His next book is Big Questions: Universe, Indianapolis, Indiana, San Francisco, California, Boston, Massachusetts. Charlotte, Carolina, from which this podcast is adapted. Stuart is a Fellow of the Royal Astronomical Society, farmacia Diflucan baratos, Diflucan online kaufen, Japan, craiglist, ebay, overseas, a Visiting Fellow of the University of Hertfordshire, UK, order Diflucan online overnight delivery no prescription, Diflucan from canadian pharmacy, and senior editor for space science at the European Space Agency. He is also a frequent contributor to newspapers, magazines, radio and television programmes, buy Diflucan without prescription. His website is www.stuartclark.com and his Twitter account is @DrStuClark, købe Diflucan online, αγοράζουν online Diflucan. Buy cheap Diflucan, Today's sponsor: This episode of "365 Days of Astronomy" is sponsored by David Rossetter on behalf of the Mid-Hudson Astronomical Association: A goofy group of geeks who love to observe and share the night sky around New York State's Mid-Hudson region.
Transcript:
WHAT WERE THE FIRST CELESTIAL OBJECTS, where can i find Diflucan online. Acheter en ligne Diflucan, acheter Diflucan bon marché, Hello I’m Dr Stuart Clark, astronomy author and journalist, buy Diflucan without prescription. Buy Diflucan without prescription, Today I’d like to explore the question: What were the first celestial objects. Buy no prescription Diflucan online, Beginning around 380,000 years after the big bang, order Diflucan online c.o.d, Indianapolis, Indiana, San Francisco, California, when atoms had just formed and X-rays permeated space, there were no galaxies, order Diflucan no prescription, 5mg, 50mg, 75mg, 100mg, no stars, and no planets, kjøpe Diflucan online, bestill Diflucan online. Where can i order Diflucan without prescription, Astronomers call it the dark ages. Gradually, Oklahoma City, Oklahoma. Las Vegas, Nevada, Buy Diflucan from mexico, gravitational attraction drew together clouds of matter and eventually the first celestial objects were born.
Whatever they were, 650mg, 800mg, 875mg, 900mg, Baltimore, Maryland. Milwaukee, Wisconsin, they pumped so much energy into space that they ripped apart almost every atom in the Universe by blasting away the electrons from their atomic nuclei. In the process, they must have created giant clouds of glowing gas, buy Diflucan without prescription. Those first luminous sources, reasons to buy Diflucan online, Where can i buy cheapest Diflucan online, more than 13 billion light years away, should still be visible to sufficiently large telescopes as tiny pinpricks of light, Diflucan over the counter. Australia, uk, us, usa, The first attempt to see into these furthest reaches was in 1995, when the orbiting Hubble Space Telescope pioneered the technique of ‘deep field’ astronomy, buy Diflucan from canada. Buy Diflucan no prescription, A ten-day observation looked at a single patch of sky, no larger than a tennis ball placed 100 metres away, where can i buy Diflucan online, Buy Diflucan online cod, near the constellation of Ursa Major. After ten days of collecting light, canada, mexico, india, Order Diflucan from mexican pharmacy, the telescope revealed 3000 celestial objects: mostly small galaxies more than 10 billion light years away. Buy Diflucan without prescription, The Hubble Deep Field offered astronomers their first real look at extremely distant realms. Previous observations, Diflucan in cats, dogs, children, man, woman, men, women, Buy generic Diflucan, with ground-based telescopes, had only detected galaxies about halfway across the Universe, Diflucan price, Comprar en línea Diflucan, comprar Diflucan baratos, and they seemed indistinguishable from present-day ones. Galaxies are classified according to their shape: elliptical galaxies are elongated clouds of stars; spirals are flat with arms that spiral around a central hub; barred-spiral galaxies have an elongated central hub connecting to the spiral arms; and there are irregularly shaped galaxies too, online buying Diflucan hcl. Austin, Texas, Memphis, Tennessee, The large numbers of small, distant galaxies in the Hubble Deep Field confirmed that today’s large galaxies began as small collections of a few million stars, buy Diflucan without a prescription, Purchase Diflucan online no prescription, either irregularly shaped or elliptical, colliding and merging to build into larger galaxies, Philadelphia, Pennsylvania. Phoenix, Arizona. Diflucan for sale, As they grew they developed appreciable gravitational fields that pulled in gas from intergalactic space until star formation spontaneously began and surrounded the galaxy with sweeping arms of new stars.
A spiral galaxy will gather gas and may occasionally cannibalize a smaller galaxy, buy Diflucan without prescription. However, rx free Diflucan, New York. Los Angeles, California, should it veer too close to a similarly sized galaxy, they will both lose all structure, Diflucan FDA approveds, Online buy Diflucan without a prescription, resulting in a fuzzy cloud of stars: an elliptical galaxy. The collision will trigger a sudden explosion of star formation, Fort Worth, Texas. Denver, Colorado, Boston, Massachusetts. Charlotte, Carolina, a starburst in the gas. The two supermassive black holes will sink towards the centre of the merged galaxy, Diflucan samples, Purchase Diflucan online, drawing each other into spiralling orbits. Their huge gravitational fields will interact, farmacia Diflucan baratos, Diflucan online kaufen, 125mg, 150mg, 200mg, 250mg, swallowing stars and throwing others into eccentric orbits. Buy Diflucan without prescription, Plunging together, they will release a torrent of radiation. Then the newly enlarged black hole will continue to consume clouds of gas, köpa Diflucan online, Osta Diflucan online, Jotta Diflucan verkossa, Detroit, Michigan, San Jose, California, stars or planets that haplessly stray into its gravitational reach. This can be a massive amount of material, buy Diflucan online no prescription, Buy cheap Diflucan no rx, and the merging galaxies will most likely become a quasar: a highly active, tremendously luminous galaxy, Diflucan withdrawal, snort, alcohol iteraction. Diflucan coupon, Quasars once populated the Universe in great numbers but have dwindled to extinction, doubtlessly because the black holes have devoured everything within their grasp, Jacksonville, Florida, Columbus, Ohio. El Paso, Texas. Washington, D.C. Seattle, Washington, Once the quasar dies down, it becomes an ordinary galaxy with a dormant black hole, Chicago, Illinois. Houston, Texas.
Cosmologists believe that in this way the Universe built its current quota of galaxies, buy Diflucan without prescription. But the nature of the first step of the sequence – the origin of the collections of a few million stars – remains elusive.
With the Hubble Space Telescope’s new camera, astronomers took the Hubble Ultra Deep Field. Covering an area of about one-tenth that of the full Moon it revealed 10,000 small galaxies, showing them as they looked around 800 million years after the big bang. But still there was no sign of the very first, individual celestial objects, more distant still, and too faint to be seen by the Hubble. Buy Diflucan without prescription, Theorists use computers to model what they were likely to have been. There are two possibilities: either they were gigantic stars, or they were black holes, already greedily sucking in radiating gas. As stars and black holes would develop in different ways, it is crucial for cosmologists to determine which they were.
Stars exert the biggest influence over the Universe’s chemical composition and none have affected it more that the earliest stars. During the ‘dark ages’ before the first luminous objects, all that existed was a diffuse sea of atoms: roughly three-quarters of it hydrogen, one quarter helium, with a seasoning of lithium. Computer models suggest that the lack of variety had a tremendous effect on the first generation of stars, buy Diflucan without prescription. As gravity pulls gas together, it heats up resisting further compression. The heat must be radiated so the star can complete pulling itself together.
Calculations show that heavy chemical elements are highly efficient radiators, whereas the light gaseous elements are not. In star formation today, the presence of elements heavier than lithium speeds up the collapse, allowing stars to form from relatively compact pockets of gas. Buy Diflucan without prescription, As a result most stars contain less mass than the Sun. Back in the dark ages, the forming stars didn’t have heavy elements to help lose heat, so more gas had to build before gravity overwhelmed it, resulting in masses from several hundred to a thousand times that of the Sun.
It seems likely a mixture of stars and black holes constituted the first celestial objects. But the only way to know is to find a way of seeing all the way back to the dark ages.
In an attempt to detect the heat from the first stars, astronomers launched a high-altitude balloon experiment in 2006, intended to measure the infrared radiation, which had been redshifted into radio waves by the expansion of the Universe. Instead, the experimenters found that a mysterious wall of radio noise, six times louder than anything the astronomers were expecting, deafened their detectors, buy Diflucan without prescription.
It may be coming from the death throes of the earliest stars. Indeed, when massive stars explode, they become billions of times brighter than normal. So perhaps the first glimpse of something from just after the dark ages will be the brilliant explosion marking the death of a monstrous star.
There is a type of celestial explosion called a gamma ray burst, apparently more energetic than any supernova in the nearby Universe. Buy Diflucan without prescription, One can be seen from Earth every day or two, but from a completely unpredictable direction. Astronomers have to be really quick to spot them because having taken billions of years to travel to us, they arrive and pass by in just a few seconds. Highly sophisticated spacecraft now lie in wait ready to guide other orbiting and ground-based telescopes into the correct direction.
Another strategy for investigating the dark ages is to look for the signal from the hydrogen gas that existed throughout space at that time. As the electrons were stripped away by the radiation from the first objects, so the hydrogen would lose its way of giving out radio waves. A radio-quiet ‘bubble’ will have formed around each new celestial object and should now appear as a collection of dark holes in the hydrogen maps, buy Diflucan without prescription. Once astronomers find these holes, the theory goes that at the centre of each will be either a megastar or a black hole and computer models predict that megastars will ‘blow bubbles’ in subtly different ways from black holes.
Astronomers dream that eventually they will be able to actually see and take pictures of the first objects, and analyse each object’s chemical composition and physical conditions; to tell them definitively what the first celestial objects were, and how the first wave of heavy chemical elements was generated. Then they can investigate how these individual objects gathered together to become the small early galaxies seen in the Hubble Deep and Ultra Deep Fields.
End of podcast:
365 Days of Astronomy
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The 365 Days of Astronomy Podcast is produced by the Astrosphere New Media Association. Buy Diflucan without prescription, Audio post-production by Preston Gibson. Bandwidth donated by libsyn.com and wizzard media. Web design by Clockwork Active Media Systems. You may reproduce and distribute this audio for non-commercial purposes. Please consider supporting the podcast with a few dollars (or Euros!). Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org. Until tomorrow...goodbye.
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