21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 6, Problem 23QP
To determine
Describe adaptive optics and explain how it makes the image quality of telescope make better.
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When astronomers discuss the apertures of their telescopes, they say bigger is better. Explain why.
a) A wider aperture can observe a significantly larger portion of the sky. b) A wider aperture makes a telescope easier to aim. c) A wider aperture allows a telescope to collect more light, so it can produce images with higher resolution. d) A wider aperture allows a telescope to collect more light, so it can detect fainter light sources.
The James Webb Telescope is an important innovation in Astronomy and its implementation was first explained to the public during the timeline of our course this summer.
Prepare an explanation which includes the following:
What is the James Webb Telescope? Include a description of the tool itself and a brief history.
What is the importance/significance of this tool for future astronomical studies?
What is the ratio of the light-gathering power of a 10-meter telescope to that of a 1‑meter telescope?
a.
10 to 1
b.
1 to 10
c.
100 to 1
d.
1 to 100
e.
3.2 to 1
Chapter 6 Solutions
21st Century Astronomy
Ch. 6.1 - Prob. 6.1ACYUCh. 6.1 - Prob. 6.1BCYUCh. 6.2 - Prob. 6.2CYUCh. 6.3 - Prob. 6.3CYUCh. 6.4 - Prob. 6.4CYUCh. 6.5 - Prob. 6.5CYUCh. 6 - Prob. 1QPCh. 6 - Prob. 2QPCh. 6 - Prob. 3QPCh. 6 - Prob. 4QP
Ch. 6 - Prob. 5QPCh. 6 - Prob. 6QPCh. 6 - Prob. 7QPCh. 6 - Prob. 8QPCh. 6 - Prob. 9QPCh. 6 - Prob. 10QPCh. 6 - Prob. 11QPCh. 6 - Prob. 12QPCh. 6 - Prob. 13QPCh. 6 - Prob. 14QPCh. 6 - Prob. 15QPCh. 6 - Prob. 16QPCh. 6 - Prob. 17QPCh. 6 - Prob. 18QPCh. 6 - Prob. 19QPCh. 6 - Prob. 20QPCh. 6 - Prob. 21QPCh. 6 - Prob. 22QPCh. 6 - Prob. 23QPCh. 6 - Prob. 24QPCh. 6 - Prob. 25QPCh. 6 - Prob. 26QPCh. 6 - Prob. 27QPCh. 6 - Prob. 28QPCh. 6 - Prob. 29QPCh. 6 - Prob. 30QPCh. 6 - Prob. 31QPCh. 6 - Prob. 32QPCh. 6 - Prob. 33QPCh. 6 - Prob. 34QPCh. 6 - Prob. 35QPCh. 6 - Prob. 36QPCh. 6 - Prob. 37QPCh. 6 - Prob. 38QPCh. 6 - Prob. 39QPCh. 6 - Prob. 40QPCh. 6 - Prob. 41QPCh. 6 - Prob. 42QPCh. 6 - Prob. 43QPCh. 6 - Prob. 44QPCh. 6 - Prob. 45QP
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- Outline the invention of a telescope. Describe the working of a telescope.arrow_forwardDescribe the techniques radio astronomers use to obtain a resolution comparable to what astronomers working with visible light can achieve.arrow_forwardDescribe one visible-light or infrared telescope that astronomers are planning to launch into space in the future.arrow_forward
- What was the problem with the Hubble Space Telescope and how was it solved?arrow_forwardDraw the light path for a Refracting telescope. Be sure to label all the parts and describe the purpose of each part. What are the advantages and disadvantages of a refracting telescope?arrow_forwardThe 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 minimumarrow_forward
- What advantages does the Hubble Space Telescope (HST) have over ground-based telescopes? List some disadvantages.arrow_forward1. The active search for extraterrestrial intelligence is mostly done with what kind of telescope? Any ground based telescope Visible light telescope Ultraviolet telescope Radio telescope Infrared telescope 2. In the history of Active SETI, only one signal has ever been detected and was never found to repeat. What is this signal known as? Voyager signal Arecibo message Wow! signal Lone signal Pioneer signal 3. The search for extrasolar planets fall broadly into two categories, what are they? Lensing and transits Astrometry and Doppler shifts Speckle imaging and interferometry Dust emission and radio bursts Direct and indirect detection 4. Saturn's moon Titan is interesting in what regard? Generates own magnetic field It has a ring structure Is not spin locked with Saturn…arrow_forward5. The two images below show a portion of the Trifid Nebula. The image on the left was made with visible light, while the image on the right (shown to the same scale) is an infrared image from the Spitzer Space Telescope. Explain why the dark streaks in the visible-light image appear bright in the infrared image. (a) Reflection nebula, Dust lanes Emission nebula. R I 10 pc www V U X G (b) wwwwww R V U X Garrow_forward
- You record the spectrum of a distant star using a telescope on the ground on Earth. Upon analysing the spectrum, you discover absorption lines spaced at intervals typical of oxygen atoms. Which of the following are possible interpretations of this evidence? Select all that apply. The width of the spectral lines gives the diameter of the star The star is likely orbited by habitable planets with breathable atmospheres. The height of the spectral lines above the star's general blackbody spectral curve tells us how much oxygen is in the star The atmosphere of Earth contains oxygen The red or blueshift of the set of lines can tell us the speed of the star's motion toward or away from usarrow_forwardHow does the resolving power of the Mount Palomar 5-m telescope compare with that of the 2.4-m Hubble Space Telescope? AMount Palomar dHubble Space Telescope Why does HST generally still outperform the ground-based 5-m telescope? The resolving power of the Mount Palomar 5-m telescope has a higher value than that of HST, and telescopes with higher values for resolving power can not distinguish objects as well as telescopes with lower values for resolving power. Earth's atmosphere affects visibility for the Mount Palomar 5-m telescope and limits resolving power to about 0.5 seconds of arc. HST is not affected by distortion due to the atmosphere. The resolving power of the Mount Palomar 5-m telescope has a lower value than that of HST, and telescopes with lower values for resolving power can not distinguish objects as well as telescopes with higher values for resolving power. HST is in orbit around the Earth, and so it is closer to the stars than the Mount Palomar 5-m telescope. By being…arrow_forwardSuppose astronomers built a 90-meter telescope. How much greater would it's light collecting area be than that of the 10-meter Keck telescope? Express your answer using two significant figures.arrow_forward
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