Reference to a case where the given method did not work This is perhaps the most common objection of all. Creationists point to instances where a given method produced a result that is clearly wrong, and then argue that therefore all such dates may be ignored. Such an argument fails on two counts:
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Since their discovery, the nature of quasars has been one of the most intriguing and baffling problems as evidenced by the following quotations: The conventional interpretation of the spectral lines observed in quasars is based on the redshift hypothesis. Three hypotheses have been advanced to account for the supposed redshifts: Cosmological hypothesis; the redshifts are due to the expansion of the universe, 2.
Gravitational hypothesis, 3 Local-Doppler hypothesis; in this hypothesis the redshifts are due to the Doppler effect, but the quasars are relatively nearby and have nothing to do with the expansion of the universe. Of these hypotheses, the first one is the most publicized one.
One is led to attribute to quasars very many mysterious properties if one assumes the redshift hypothesis to be correct. A patient analysis of the data on quasars over the years has led to the conclusion that the real source of the trouble is in the assumption that the spectra of quasars have redshifts.
In the early 's quasars were known as 'radio stars' because the method used to discover the first quasars was based on coincidences between a strong radio source and a point-like optical source. Since each radio source was associated with a star it was originally thought that quasars were objects within the galaxy hence the term 'radio stars'.
Quasars or quasi-stellar radio source, from the method by which they where originally discovered: With increasing spatial resolution of radio telescopes the strong radio emission often seemed to come from a pair of lobes surrounding many of these faint star-like emission line objects.
The initial method of selection was strong radio emission, and then later any object with blue or ultraviolet excess was considered a good quasar candidate. Very recent evidence from the near infrared portion of the spectrum indicates that a large fraction of quasars may in fact be brighter in the infrared than in other wavelength bands.
Answering these basic questions may summarize much of the information regarding Quasar. What is the definition of a quasar? When radio telescopes were first turned on the heavens, point sources of radio waves were discovered along with spread-out regions of emission along our Milky Way.
Astronomers using ordinary visible-light telescopes turned toward these radio points and looked to see what was there.
In some cases a supernova remnant was found, in others, a large star-birth region, in others a distant galaxy. But in some places where point sources of radio waves were found, no visible source other than a stellar-looking object was found it looked like a point of a star.
These objects were called the quasi-stellar radio sources or quasars for short. Later, it was found these sources could not be stars in our galaxy, but must be very far away as far as any of the distant galaxies seen.
We now think these objects are the very bright centers of some distant galaxies, where some sort of energetic action is occurring, most probably due to the presence of a supermassive black hole at the center of that galaxy. Supermassive - made up from a mass of about a billion solar masses.
What do quasars have to do with black holes? It is thought the infall of matter into the Supermassive black hole can result in very hot regions where huge energies are released, powering the quasar.kaja-net.com: Cosmos (Audible Audio Edition): Carl Sagan, LeVar Burton, Seth MacFarlane, Neil deGrasse Tyson, Ann Druyan, Brilliance Audio: Books.
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An important concept in structure formation is the notion of the Hubble radius, often called simply the horizon, as it is closely related to the particle kaja-net.com Hubble radius, which is related to the Hubble parameter as = /, where is the speed of light, defines, roughly speaking, the volume of the nearby universe that has recently (in the last .
Professional portfolio of Anatoly Zak, space historian and journalist. Introduction Though perhaps best known throughout the world for his science fiction, Isaac Asimov was also regarded as one of the great explainers of science. Free holes papers, essays, and research papers.
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