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Orion nebula analysis
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Orion nebula analysis
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In 1610, two years after the invention of the telescope, the Orion Nebula, which looks like a star to the naked eye, was discovered by a scholar named Nicolas-Claude Fabri Peiresc. In 1656 Christan Huygens, the Dutch scholar and scientist, using his own greatly improved instruments, was the first to describe the inner region of the nebula, and to determine that its inner star is not single but a compact quadruple system.
Early 18th-century observational astronomers gave high priority to comet seeking. A by-product of their search was the discovery of many bright nebulae. Several catalogs of special objects were compiled by comet researchers; by far the best known is that of the Frenchman Charles Messier, who in 1781 compiled a catalog of 103 nebulous, or extended, objects in order to prevent their confusion with comets. Most are clusters of stars, 35 are galaxies, and 11 are nebulae. Even today many of these objects are commonly referred to by their Messier Catalog number; M20, for instance, is the great Trifid Nebula, in the constellation Sagittarius.
THE WORK OF THE HERSCHELS
By far the greatest observers of the early and middle 19th century were the English astronomers William Herschel and his son John. Between 1786 and 1802 William Herschel, aided by his sister Caroline, compiled three catalogs totaling about 2,500 clusters, nebulae, and galaxies. John Herschel later added to the catalogs 1,700 other nebulous objects in the southern sky visible from the Cape Observatory in South Africa but not from London and 500 more objects in the northern sky visible from England.
The catalogs of the Herschels formed the basis for the great New General Catalogue (NGC) of J.L. Dreyer, published in 1888. It contains the location and a brie...
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...ry high spectral resolution (i.e., to distinguish slightly differing wavelengths). For even higher spectral resolution astronomers employ Fabry-Perot interferometers. Spectra provide powerful diagnostics of the physical conditions within nebulae. Images and spectra provided by Earth-orbiting satellites, especially the Hubble Space Telescope, have yielded data of unprecedented quality.
Ground-based observations also have played a major role in recent advances in scientific understanding of nebulae. The emission of gas in the radio and submillimetre wavelength ranges provides crucial information regarding physical conditions and molecular composition. Large radio telescope array's, in which several individual telescopes function collectively as a single enormous instrument, give spatial resolutions in the radio regime far superior to any yet achieved by optical means.
On the night of October 1, 1847 Maria Mitchell discovered a comet just above the North Star. But by the time her letter of discovery reached William Bond (director of the Harvard Observatory) Father de Vico at the Vatican Observatory in Rome had already announced his discovery of the same comet on October 3. Professor Bond began a campaign to get Maria her rightful award.
Messier 8, nicknamed the Lagoon Nebula is an interstellar cloud located in Sagittarius, discovered by John Flamsteed in 1680. It is one of the few nebulae that can be seen by the naked eye. It was given its nickname by Agnes
High precision spectrometers such as HARPS are required to preform observations as very high signal to noise ratio. HARPS is a high resolution fiber-fed echelle spectrograph. To maximize the chance of detecting an exoplanet certain requirements have to be met by potential targets. The targets chosen to be studied by HARPS are selected from COR...
Nebula that was destroyed after it’s sun went supernova. Troubled by his findings, the priest
2, Alter Dinsmore, Cleminshaw H. Clarence, Philips G John. Pictorial Astronomy. United States: Sidney Feinberg, 1963.
The Orion Nebula contains one of the brightest star clusters in the night sky. With a magnitude of 4, this nebula is easily visible from the Northern Hemisphere during the winter months. It is surprising, therefore, that this region was not documented until 1610 by a French lawyer named Nicholas-Claude Fabri de Peiresc. On March 4, 1769, Charles Messier inducted the Orion Nebula, M42, into his list of stellar objects. Then, in 1771, Messier released his list of objects for its first publication in Memoires de l’Academie.1
Solar nebula is a rotating flattened disk of gas and dust in which the outer part of the disk became planets while the center bulge part became the sun. Its inner part is hot, which is heated by a young sun and due to the impact of the gas falling on the disk during its collapse. However, the outer part is cold and far below the freezing point of water. In the solar nebula, the process of condensation occurs after enough cooling of solar nebula and results in the formation into a disk. Condensation is a process of cooling the gas and its molecules stick together to form liquid or solid particles. Therefore, condensation is the change from gas to liquid. In this process, the gas must cool below a critical temperature. Accretion is the process in which the tiny condensed particles from the nebula begin to stick together to form bigger pieces. Solar nebular theory explains the formation of the solar system. In the solar nebula, tiny grains stuck together and created bigger grains that grew into clumps, possibly held together by electrical forces similar to those that make lint stick to your clothes. Subsequent collisions, if not too violent, allowed these smaller particles to grow into objects ranging in size from millimeters to kilometers. These larger objects are called planetesimals. As planetesimals moved within the disk and collide with one another, planets formed. Because astronomers have no direct way to observe how the Solar System formed, they rely heavily on computer simulations to study that remote time. Computer simulations try to solve Newton’s laws of motion for the complex mix of dust and gas that we believe made up the solar nebula. Merging of the planetesimals increased their mass and thus their gravitational attraction. That, in turn, helped them grow even more massive by drawing planetesimals into clumps or rings around the sun. The process of planets building undergoes consumption of most of the planetesimals. Some survived planetesimals form small moons, asteroids, and comets. The leftover Rocky planetesimals that remained between Jupiter and Mars were stirred by Jupiter’s gravitational force. Therefore, these Rocky planetesimals are unable to assemble into a planet. These planetesimals are known as asteroids. Formation of solar system is explained by solar nebular theory. A rotating flat disk with center bulge is the solar nebula. The outer part of the disk becomes planets and the center bulge becomes the sun.
Sir William Herschel discovered the planet Uranus in 1781. It was the first planet to be discovered in more modern times with the help of telescopes, and when Herschel first discovered it, he thought it was a comet. The orbit of the planet, however, was different from what scientists thought the orbit should be, so they figured that the reason for that was another object near the planet. They turned out to be right, and the planet Neptune was discovered in 1846. Herschel found Uranus because he was looking for double stars, and just so happened to come across the planet. He originally called the planet Georgium Sidus after King George III, but later scientists changed the name to
'A discovery so unexpected could only have singular circumstances, for it was not due to an astronomer and the marvelous telescope…was not the work of an optician; it is Mr. Herschel, a [German] musician, to whom we owe the knowledge of this seventh principal planet.' (Hunt, 35)
By 1936, astronomers had realized that the hazy balls they sometimes saw in their telescopes, which looked like stars obscured by gas, were actually galaxies (Hibbison).
Tyler, Pat. Supernova. NASA’s Heasarc: Education and Public Information. 26 Jan. 2003. 22 Nov. 2004
Shklovskii, Iosif S. Stars: Their Birth, Life, and Death. Moscow: Central Press for Literature in Physics and Mathematics, 1975.
Perhaps one of the most interesting features of our fathomless universe are the planets that are classified as gas giants. Huge, turbulent, and distant, the gas giants are some of the most enigmatic features in our Solar System. I have a personal interest to the gas giants and celestial bodies in general. When I was a child, I was fascinated by our Solar System. I read innumerable books about space, and my interests of outer space had been piqued further by other forms of media. Although I held this interest of space, growing up left me with little time to learn about space, and I lost interest for a while. Taking Earth Science in Milpitas High re-invigorated my interests in the celestial bodies. Using this class, I’m now able to focus on learning more about our colossal universe, in particular, the outer planets.
The first reference to the Andromeda Galaxy was around 964 by the Persian astronomer Abd al-Rahman al-Sulfi in his Book of Fixed Stars in which he described it as like a little cloud. After this the first description of the Andromeda Galaxy through a telescope was by a German Astronomer by the name of Simon Marius on December15, 1612. After this Charles Messier catalogued the Andromeda Galaxy in M31 in the year of 1764 which made people incorrectly give credit to Messier for the discovery of this galaxy although it was visible to the naked
A year later, using such an early refracting telescope, Galileo Galilei, an Italian physicist and astronomer, noticed the craters and mountains on the moon as well as what was later coined as the Milky Way Galaxy.