A star is an astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.The nearest star to Earth is the Sun.Many other stars are visible to the naked eye at night, but due to their immense distance from Earth they appear as fixed points of light in the sky. The composition of Our Gas Giants may resemble that of Our Sun, yet they have not the Power Of Ignition! This only tells you what the composition is at the surface . E) There is an approximately equal number of all spectral type stars in the cluster. You are actually asking about 2 different things so I will answer for each of them. These were shown to be caused by elements emitting or absorbing light at specific wavelengths. Astronomers had identified elements like calcium and iron as responsible for some of the most prominent lines, so they naturally assumed that such heavy elements were among the major constituents of the stars. Ever star is born of a nebula made up of gas and dust, and each one is different. In principle, it seemed that one might obtain the composition of the stars by comparing their spectral lines to those of known chemical elements observed in laboratory spectra. Most ordinary matter consists of hydrogen and helium located in interstellar and intergalactic space. Let's start by looking at the chemical composition of the star … All these stars, old to young, are fairly homogeneous in their chemical composition, which is similar to that of the Sun. The rule of thirds is thought to be a simplification of the golden mean. D) All stars in the cluster will evolve similarly. The spectra of the Sun and stars exhibited bright and dark lines called Fraunhofer lines. Because each element emits or absorbs light only at specific wavelengths, the chemical composition of stars can be determined. all colors, wouldn't their emitted spectra be identical and useless in distinguishing differnces in composition? The composition of such a cloud of matter determines the composition of the star which results from the collapse. Composition is essentially the same thing. The chemical composition of the Universe is dominated by the hydrogen and helium produced in the Big Bang.The remaining 90 or so chemical elements are produced in stars and constitute only a few percent of the overall mass. How do stars form and evolve? Answers (1) Alexandra Silva 20 July, 09:41. B) All stars in the cluster are approximately the same age. The original, so-called primordial, composition of the Universe is studied in such fine detail because it is one of the keys to our understanding of … Jagadheep built a new receiver for the Arecibo radio telescope that works between 6 and 8 GHz. Our calculations of speed, size, composition, and atmosphere of distant planets were little more than a guess, but our skills have improved an incredible amount in the past century. Composition of The Sun:-#=># #color(blue)"75 % of Hydrogen"# #=># #color(blue)"25 % of Helium"# #=># and 0.1 5 of other metals which contains, #color(blue)"iron, nickel, oxygen, silicon, sulfur, magnesium, carbon, neon, calcium and chromium"# Relationship of the sun with other stars;-#=># Sun is not the biggest celestial body which many have the misconception of. It is the remains of a star that has gone nova. Select one: a. gamma rays b. microwaves c. visible light d. radio waves +4. The force of gravity is what creates it's high density (think mass of the sun compressed into the volume of the Earth). He studies 6.7 GHz methanol masers in our Galaxy.These masers occur at sites where massive stars are being born. Hot dense objects emit a continuous spectrum of light, regardless of their particular elemental composition by blackbody radiation.The Sun and Earth behave this way. How do astronomers know what stars are made of when those stars are light years away from Earth? Unlike the Earth, the Sun is made primarily of light elements. The basic idea of spectroscopy A spectrograph takes light from a source and separates it by wavelength, so that the red light goes in one direction, the yellow light in another direction, the blue light in another direction, and so forth. All heavier elements, called metals in astronomy, account for less than 2% of the mass, with oxygen (roughly 1% of the Sun's mass), carbon (0.3%), neon (0.2%), and iron (0.2%) being the most abundant. Only about one-half of 1% of the critical density of the universe is found in stars. Stars come in a variety of masses, and mass determines how hot the star will burn and how it will die. These demonstrations by Dr Francisco Diego reveal the colors of light that are produced from sodium chloride, rubidium chloride, and copper sulfate, hinting at how we identify the chemical compositions of those distant stars.File under astronomical spectroscopy: Even though it is constantly exploding in a nuclear reaction, the Sun and other stars are so large and have so much matter in them that it will take billions of years for the explosion to use all the "fuel" in the star. Scientists use spectroscopy to determine the composition of the Sun. Heavy stars turn into supernovae, neutron stars and black holes whereas average stars like the sun end life as a white dwarf surrounded by a disappearing planetary nebula. Why doesn't the Sun emit just the spectra of hydrogen and helium? The Sun is a disk star about 8 kpc (25,000 ly) from center. 17.1 The Brightness of Stars; 17.2 Colors of Stars; 17.3 The Spectra of Stars (and Brown Dwarfs) 17.4 Using Spectra to Measure Stellar Radius, Composition, and Motion; Key Terms; Summary; For Further Exploration; Collaborative Group Activities Rod Martin Jr from Cebu, Philippines on November 13, 2013: I've never really been fascinated with the exotic types. A) All stars in the cluster are approximately the same color. About 73% of the Sun’s mass is hydrogen, and another 25% is helium. The Composition of the Sun . A star’s composition is the result of its formation history. This is known as its spectrum. Scientists have samples from the surface, or crust, of the moon, but the composition … The Sun is composed primarily of the chemical elements hydrogen and helium.At this time in the Sun's life, they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. Composition Astronomers use a spectroscope to determine what stars are made of by their spectral lines • Hydrogen (70% of the total mass of a star ) • Helium (28% of the total mass of a star) • Trace Elements- O, Ne, C, N and other elements (2% )