Concept explainers
Group Activity: Which Telescope? You represent a research group that wishes to observe matter around a black hole; assume that the mat-ter is emitting photons at all wavelengths. You have the opportunity to make your observations with one of the following four telescopes:
• A radio telescope, 300 meters in diameter, located in Puerto Rico • An infrared telescope, 2 meters in diameter, on a spacecraft in orbit around Earth and observing at a wavelength of micrometers
• An infrared telescope, 10 meters in diameter, equipped with adaptive optics, located on Mauna Kea in Hawaii and observ-ing at a wavelength of micrometers (10-5 m)
• An x-ray telescope, 2 meters in diameter, located at the South Pole Discuss the pros and cons of each telescope for this observing task, then come to a group consensus in which you rank the four choices from best to worst. Compare your rankings to those of other groups in your class. Note: You may wish to do this activity using the same four roles described in Chapter 1, Exercise 39.
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Essential Cosmic Perspective
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- Hubble’s Field of View. Large telescopes often have small fields of view. For example, the Hubble Space Telescope’s (HST’s) advanced camera has a field of view that is roughly square and about 0.06° on a side. a. Calculate the angular area of the HST’s field of view in square degrees. b. The angular area of the entire sky is about 41,250 square degrees. How many pictures would the HST have to take with its camera to obtain a complete picture of the entire sky?arrow_forwarda) To which object corresponds this spectrum to? b) What is the source of radiation for each of the two humps? c) Why does the hump on the right hand side peak at higher wavelength than the hump on the left? [Specifically, what does this tell you about the temperature for each object that the light originates from?]arrow_forwardA planetary nebula is visible due to ____.a. blackbody continuum radiation from the interstellar mediumb. line emission from the interstellar mediumc. scattering from dust grains ejected by a dying stard. blackbody continuum radiation from a hot gas ejected by a dying stare. line emission from ionized hydrogen gas ejected by a dying star My guess is E. Please help me understand why I am wrong if so.arrow_forward
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