Friday, February 27, New Insight Found in Black Hole Collisions New research by the University of Texas UT at Dallas astrophysicist provides revelations about the most energetic event in the universe — the merging of two spinning, orbiting black holes into a much larger black hole. The work by Dr. Michael Kesdenassistant professor of physics at UT Dallas, and his colleagues provides for the first time solutions to decades-old equations that describe conditions as two black holes in a binary system orbit each other and spiral in toward a collision. The research is available online and in the Feb.
History[ edit ] The history of the subject began with the development in the 19th century of wave mechanics and the exploration of phenomena associated with the Doppler effect. The effect is named after Christian Dopplerwho offered the first known physical explanation for the phenomenon in Only later was Doppler vindicated by verified redshift observations.
The first Doppler redshift was described by French physicist Hippolyte Fizeau inwho pointed to the shift in spectral lines seen in stars as being due to the Doppler effect. The effect is sometimes called the "Doppler—Fizeau effect".
InBritish astronomer William Huggins was the first to determine the velocity of a star moving away from the Earth by this method. Adams inin which he mentions "Two methods of investigating that nature of the nebular red-shift".
Slipher first reports on his measurement in the inaugural volume of the Lowell Observatory Bulletin. To determine the redshift, one searches for features in the spectrum such as absorption linesemission linesor other variations in light intensity.
If found, these features can be compared with known features in the spectrum of various chemical compounds found in experiments where that compound is located on Earth.
A very common atomic element in space is hydrogen. The spectrum of originally featureless light shone through hydrogen will show a signature spectrum specific to hydrogen that has features at regular intervals.
If restricted to absorption lines it would look similar to the illustration top right. If the same pattern of intervals is seen in an observed spectrum from a distant source but occurring at shifted wavelengths, it can be identified as hydrogen too.
If the same spectral line is identified in both spectra—but at different wavelengths—then the redshift can be calculated using the table below. Determining the redshift of an object in this way requires a frequency- or wavelength-range.
In order to calculate the redshift one has to know the wavelength of the emitted light in the rest frame of the source, in other words, the wavelength that would be measured by an observer located adjacent to and comoving with the source. Since in astronomical applications this measurement cannot be done directly, because that would require travelling to the distant star of interest, the method using spectral lines described here is used instead.
Redshifts cannot be calculated by looking at unidentified features whose rest-frame frequency is unknown, or with a spectrum that is featureless or white noise random fluctuations in a spectrum.
In astronomy, it is customary to refer to this change using a dimensionless quantity called z.Time. Time is what we use a clock to measure. Information about time tells us the durations of events, and when they occur, and which events happen before which others, so time has a very significant role in the universe's organization.
Black holes are a phenomenon predicted by Albert Einstein's General Theory of Relativity, which was published in In fact, the idea of a black hole was proposed as early as by the amateur British astronomer John Michell (and independently by the Frenchman Pierre-Simon Laplace in ).
Characteristics of Black Holes: Definition:A Black hole is an area in space in which the pull of gravity is so great that not even light can escape it once it timberdesignmag.com the escape velocity from a black hole is greater than light, escaping it is impossible.
acquired trait: A phenotypic characteristic, acquired during growth and development, that is not genetically based and therefore cannot be passed on to the next generation (for example, the large. The Characteristics of a Black Hole, a Phenomenon in the Universe. 1, words. An Analysis of the Black Hole Creation and the Huge Gravitational Field.
1, words. words. 2 pages. The Effects of Solutions on Ion Transportation Across Membranes. 2, words. 4 pages. The Characteristics of Purple Loosestrife, an Invasive Exotic. This in turn makes black holes some of the brightest and most energetic phenomenon in the universe.
In fact black holes are some of the most thoroughly studied objects in the cosmos and we have a lot of accurate information about their intrinsic characteristics as a result.