By Eric Hovind on May 5, in Articles , Beginner Whenever the worldview of evolution is questioned, the topic of carbon dating always comes up. Here is how carbon dating works and the assumptions it is based upon. How Carbon Dating Works Radiation from the sun strikes the atmosphere of the earth all day long. This energy converts about 21 pounds of nitrogen into radioactive carbon This radioactive carbon 14 slowly decays back into normal, stable nitrogen. Extensive laboratory testing has shown that about half of the C molecules will decay in 5, years. This is called the half-life. In theory it would never totally disappear, but after about 5 half-lives the difference is not measurable with any degree of accuracy.
Astrology Advice You’re tired of hitting the bar scene and too old for the clubs, so you decide to check out some dating websites. At this point, you are thinking that there is nothing to lose since you are already tired and drained from your relationship search. Positive aspects of perusing the profiles on online dating sites: You can search for men or women without leaving your house.
You can get to know the likes and dislikes of a potential date without having to ask. You can find out personal information without first interviewing the person.
Trekkie Dating is part of the Online Connections dating network, which includes many other general and trekkie dating sites. As a member of Trekkie Dating, your profile will automatically be shown on related trekkie dating sites or to related users in the Online Connections network at no additional charge.
These had a Long Count date. They also included a supplementary series. The supplementary series included lunar data – the number of days elapsed in the current lunation, the length of the lunation and the number of the lunation in a series of six. Some of them included an day count which may be a count of the days in a cycle associated with Jupiter. See Jupiter and Saturn below. Some other astronomical events were recorded, for example the eclipse warning on Quirigua Stela E – 9.
A partial solar eclipse was visible in Mesoamerica two days later on 9. These contain both calendric and astronomical content. Methods of astronomical observation[ edit ] Figure from the Madrid Codex , interpreted as an astronomer  The Caracol at Chichen Itza is an observatory Maya astronomy was naked-eye astronomy based on the observations of the azimuths of the rising and setting of heavenly bodies.
Astronomy & Space
Exo-Moons and Goblins The discovery of planets orbiting around other stars has been one of humankinds greatest achievements. Since the first confirmed detection of a planet around another normal star 51 Peg in , many thousands of planets have been discovered. Indeed, it is likely that most stars will have their own system of planets.
It is important in answering the question — is there intelligent life out there?
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Click on any image for a larger view. Scroll to view more items. Lacquered brass sighting tubes, with plain glass “lenses”, are mounted through rectangular wood pillars, on a steel column and cast iron base. An air gap is present between the two ends of the “telescope”. An observer sees very clearly through the instrument, even when an opaque obstacle is placed in the air gap!
A sliding wood panel reveals the secret — a sequence of four plane mirrors which direct the light down, across, and back up to the viewer. Turner in Nineteenth Century Scientific Instruments , along with an engraving by Tissandier showing such a telescope in use, the observer looking directly through a massive stone! A simple device, but quite uncommon, this the first example we have seen on the market.
Craftsmanship is excellent, and it gives superb images even in daytime. The telescope is contained in its wonderful original shaped case of wood lined with green velvet and covered in black fishskin. Condition is very fine throughout, noting a bit of rubbing to the original lacquer finish on the brass, and loss of one small semicircular end to the case.
Astronomy Websites We’ve split this area into two: Entertainment websites allow you keep up-to-date with the latest astronomy discoveries or learn more about the night skies, while the practical sites offer valuable assistance with observing or areas of wider astronomy-related interest. Clicking on the icons will take you to any of the sites – they’re all our own picks based on the quality of their content.
Delve in and enjoy!
d. current page: More Resources> Best Websites. d: Outstanding websites for astronomy enthusiast. Special Mention. Zooniverse: People-Powered erse provides opportunities for people around the world to contribute to real discoveries in fields ranging from astronomy to zoology.
What caused the Little Ice Age? By Phil Plait February 1, 7: The period is known as the Little Ice Age, and its cause has always been something of a mystery. However, new research by scientists at the University of Colorado-Boulder yay team! Radiocarbon dating of plants from Baffin Island north of the Hudson Bay in Canada and sediment samples from a lake in Iceland indicate that there was a rapid onset of severe cooling at that time. More importantly, this narrows down the cause of the LIA: The ash would have darkened the atmosphere, letting slightly less sunlight down.
Some of the gases emitted by volcanoes also cool the air. It seems clear these volcanoes are what triggered the Little Ice Age.
Protecting the Earth from Cosmic Clashes
A quiet but steady meteor shower should be at its peak over the next night or two. November 15 — Moon and Mars The most prominent features on Mars are its polar ice caps. November 14 Look for Mars quite close to the upper left of the Moon this evening. Although it has faded a good
Best horoscope sites is ranked according to the amount of traffic each astrology website receives based on the Alexa Traffic Rank.. Bookmark this list of the top 50 astrology sites for future reference. Best horoscope sites was last updated on July 4,
Are we headed for a new ice age? By Phil Plait June 17, 6: Can this mean the Earth itself will literally cool off, slipping into an ice age? The answer — spoiler alert! And if you have the attention span of an E. One in particular was Caspar Ammann , who was very helpful in explaining the solar connection with the Little Ice Age to me. The strength and complexity of the solar field governs a lot of the surface activity, including sunspots , solar flares , prominences , and coronal mass ejections.
But scientists studying the Sun have seen three independent lines of reasoning indicating that the next rise to the solar peak, in or so, may be delayed or even not occur at all. I wrote about this in an earlier post , so you can get the details there. Doug is an acquaintance of mine; I interviewed him for an episode of “Bad Universe” about solar storms] , has written a document calling the findings into question.
At this point you may be asking, so what? If the Sun has fewer sunspots and no flares, what difference does that make here on Earth? And how could it possibly trigger an ice age? The Little Ice Age In the late 17th and early 18th centuries, much of Europe experienced incredibly cold winters.
See my copyright notice for fair use practices. Select the photographs to display the original source in another window. Links to external sites will be displayed in another window. Terrestrial planets have hard surfaces that can be re-shaped by several different processes: Impact Cratering There are still small chunks of rock orbiting the Sun left over from the formation of the solar system.
Director of Undergraduate Studies: Its goal is to construct testable, quantitative, coherent models of the universe the UNIty of the diVERSE and its contents-galaxies, stars, and planets. The department offers two majors, both of which require a solid grounding in the mathematics and physics necessary for the pursuit of the discipline. The astrophysics major is designed as preparation for graduate study and consists of a standard physics major sequence; a yearlong introduction to astrophysics typically taken in the sophomore year, but open to first-years with adequate preparation in calculus and physics ; and two required courses covering advanced topics in astronomy.
Students begin the research project in the fall and complete the written thesis in the spring. The astronomy major provides a basis for further study in the field, but is also designed to be compatible with liberal arts students who pursue other careers and those wishing to combine astronomy with related sciences other than physics, such as chemistry or geology.
It requires only two physics courses beyond the introductory sequence and can be completed easily if begun in the sophomore year. The department offers numerous introductory astronomy courses at the level that do not have prerequisites. Students should inquire with the director of undergraduate studies if they have specific questions on the course schedule.
It requires students to attend the department colloquia and a seminar designed to help students understand the colloquium topic. The level courses need not be taken in any particular order.
Home Astronomy Lists List of Best Space and Astronomy Websites List of Best Space and Astronomy Websites September 30, Peter Christoforou Astronomy Lists 1 Although there are millions of websites that deal with astronomy, cosmology, and space in general, many are guilty of disseminating half-truths, distorted truths, or just plain bad science. So where do you start to look for accurate, up-to-date, and relevant information when you need answers to your questions?
It is not as difficult as you might think, and to help you in your search, we have compiled a list of the top websites that publish reliable, accurate, and relevant information- whatever your needs may be. Information on this site is aimed at both amateur and professional astronomers, and the only criticism that could ever be levelled at the site involves the sheer enormity of it. It would take several years to read everything on the site, by which time one would have to start at the beginning again, since by then, everything will have been updated many times.
Everything Worth Knowing About Scientific Dating Methods This dating scene is dead. The good dates are confirmed using at least two different methods, ideally involving multiple independent labs for each method to cross-check results. Sometimes only one method is possible, reducing the confidence researchers have in the results.
Methods fall into one of two categories: These methods — some of which are still used today — provide only an approximate spot within a previously established sequence: Think of it as ordering rather than dating. One of the first and most basic scientific dating methods is also one of the easiest to understand. Paleontologists still commonly use biostratigraphy to date fossils, often in combination with paleomagnetism and tephrochronology.
A submethod within biostratigraphy is faunal association: Sometimes researchers can determine a rough age for a fossil based on established ages of other fauna from the same layer — especially microfauna, which evolve faster, creating shorter spans in the fossil record for each species. The polarity is recorded by the orientation of magnetic crystals in specific kinds of rock, and researchers have established a timeline of normal and reversed periods of polarity.
Paleomagnetism is often used as a rough check of results from another dating method. Within hours or days of a volcanic eruption, tephra — fragments of rock and other material hurled into the atmosphere by the event — is deposited in a single layer with a unique geochemical fingerprint.
List of Best Space and Astronomy Websites
Writing in the Roman era , Clement of Alexandria gives some idea of the importance of astronomical observations to the sacred rites: He must know by heart the Hermetic astrological books, which are four in number. Of these, one is about the arrangement of the fixed stars that are visible; one on the positions of the sun and moon and five planets; one on the conjunctions and phases of the sun and moon; and one concerns their risings.
They have been identified with two inscribed objects in the Berlin Museum ; a short handle from which a plumb line was hung, and a palm branch with a sight-slit in the broader end. The latter was held close to the eye, the former in the other hand, perhaps at arms length.
StarDate is the public education and outreach arm of the University of Texas McDonald Observatory. Our radio program airs daily on almost stations. And our popular bimonthly astronomy magazine is the perfect skywatching companion for anyone interested in astronomical events and space exploration.
The Rubidium PC; size 43kB. Electrical schematics for a phase locked frequency synthesizer to substitute for the error-prone clock crystal in a PC or workstation. Atomic oscillator not supplied; an external frequency standard is required. Try these vendors for surplus rubidium oscillators: Vigilante Electronics , Lehman Scientific C language numerical source codes These files relate to C compiler and run-time library features or bugs. Test printf and scanf; size 72kB. Program to test the accuracy of your floating point printf and scanf C library mathematical functions.
Test powers of 10; size kB. Program to test your C compiler’s ability to compile powers of Binary patterns are for IEEE format. This archive contains C source and object files to improve floating point printf and scanf accuracy of D. Hexadecimal floating-point constants; size 7KB. GNU C compiler source code patch to make gcc recognize floating-point numbers written not only in the usual decimal notation, such as 1.