Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 23, Problem 6Q
To determine
The way a 100-inch telescope (the largest telescope in the world in 1923) was helpful to be used.
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Quasars, an abbreviation for quasi-stellar radio sources, are distant objects that look like stars through a telescope but that emit far more electromagnetic radiation than an entire normal galaxy of stars. An example is the bright object below and to the left of center in Fig; the other elongated objects in this image are normal galaxies. The leading model for the structure of a quasar is a galaxy with a supermassive black hole at its center. In this model, the radiation is emitted by interstellar gas and dust within the galaxy as this material falls toward the black hole. The radiation is thought to emanate from a region just a few light-years in diameter. (The diffuse glow surrounding the bright quasar shown in Fig. is thought to be this quasar’s host galaxy.) To investigate this model of quasars and to study other exotic astronomical objects, the Russian Space Agency has placed a radio telescope in a large orbit around the earth. When this telescope is 77,000 km from earth and the…
The 305-m-diameter Arecibo radio telescope pictured in figure below detected radio waves with a 9-
cm average wavelength.
Hint
a. What was the angle between two just-resolvable point sources for this telescope?
Minimum resolvable angle was
urad.
b. How close together could these point sources be at the 2.57 million light-year distance of the
Andromeda Galaxy? (Note: Estimated radius of the Andromeda Galaxy is about 7 x 10¹7 km.)
The point sources could be as close as
resolvable distance.
x1015 km for minimum
For a Cassegrain Telescope;
Chapter 23 Solutions
Universe: Stars And Galaxies
Ch. 23 - Prob. 1QCh. 23 - Prob. 2QCh. 23 - Prob. 3QCh. 23 - Prob. 4QCh. 23 - Prob. 5QCh. 23 - Prob. 6QCh. 23 - Prob. 7QCh. 23 - Prob. 8QCh. 23 - Prob. 9QCh. 23 - Prob. 10Q
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- What is the area, in square meters, of a 10-m telescope?arrow_forwardEdwin Hubble established the existence of separate, distant galaxies when he found __________ stars in the __________ Nebula and used them to measure its distance. He did this work with the world’s largest telescope (at the time) at the _____________. Hubble classified galaxies on the basis of their shapes, into spirals, ____________, and irregulars. Later, working with his assistant, ___________, he showed by using __________, that most of the galaxies were moving away from us, and that the further away a galaxy was, the ___________ it was moving away.arrow_forward2:54 PM Fri 23 Apr * ni 26% web.whatsapp.com + blob:https://web.whatsapp.com/d4009cff-87ec-4851-8d8a-2f11269ecb47 G Identify the names of the four major arms of Milky way galaxy : - Google S... This section contains 6 multiple choice questions. There can be more than one correct answer. Each question is of 3 marks. For an incorrect answer, 1 mark will be deducted. However, a partial mark will be awarded for every correct option unless no incorrect option has been chosen. Multi correct : Q.1 A human eye is most sensitive to that wavelength( Am) at which the energy distribution of solar radiation shows the maximum. A. Apply Wien's Displacement law to calculate Am . Take the sun's surface temperature as 5800 K , and wein's constant, b = 0.29cm.K. B. Taking the average surface temperature of the earth as approximately 290K, calculate the wavelength at which it radiates most. = 5000 A° a) For part A, Am b) For part B, 2,m would be in infrared region of electromagnetic spectrum c) For part…arrow_forward
- The Andromeda galaxy lies about 2.5 million light-years away. To what distances do the angular resolutions of SST (3") correspond at that distance?arrow_forwardThe fact that many radio lobes emit less intensely on the side of the galaxy facing away from Earth suggests that a. they are formed by material falling into the galaxy. b. they are powered by black body radiation. c. they are excited by radiation from nearby galaxies. d. they are powered by the rapid rotation of the galaxy. e. they are created by jets of high-speed matter in magnetic fields, which tend to emit photons in the direction they are moving.arrow_forwardWhat is the area of an 23 meter telescope, consider the area of a circlearrow_forward
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