Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 16, Problem 4CC
To determine
The reason due to which astronomers estimate that the Sun can continue to shine for more than 5 billion years.
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If our Sun has a temperature of 6000 K and a luminosity of 1 Solar Luminosity (1 L, by definition), what is the luminosity of another star the same size as the Sun, yet which has a surface temperature of 12 000 K ?
how big is the sun?
Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0×10-12 watt/m?. How far away is it? Give your answer in both kilometers and light-years.
Chapter 16 Solutions
Universe
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Is the Sun on the zero-age main sequence? Explain your answer.arrow_forwardDo the previous problem again, this time using the information that the Sun is 150,000,000 km away. You will get a very large number of km as your answer. To get a better feeling for how the distances compare, try calculating the time it takes light at a speed of 299,338 km/s to travel from the Sun to Earth and from Alpha Centauri to Earth. For Alpha Centauri, figure out how long the trip will take in years as well as in seconds.arrow_forwardThere are two parts to this question. I need to know how many times fainter Venus is from a distance of 6 pc and what the apparent magnitude would be as well! Thank you!!arrow_forward
- Multiple choice. The total Sun's energy output for every second can power Earth in modern time hundreds of years several hundreds of thousands years about 50-100 years millions of years billions of yearsarrow_forwardIf our Sun has a temperature of 6000 K and a luminosity of 1 Solar Luminosity, what is the luminosity of another star the same size as the Sun, yet which has a surface temperature of 12 000 K ?arrow_forwardPart 3 1. The diameter of the Sun is 1,391,400 km. The diameter of the Moon is 3,474.8 km. Find the ratio, r= Dsa/Dsvan between the sizes. 2. From the point of view of an obs erver on Eanth (consider the Earth as a point-like object), during the eclipse, the Moon covers the Sun exactly. Sketch a picture to illustrate this fact. Use a nuler to get a straight line. Your drawing does not need to be in scale. 3. The Sun is 1 Astronomical Unit (AU) away from the Earth. Find the distance between the Earth and the Moon in AU's using the ratio of similar triangles. Show your work. DEM= AU. Convert this to kilometers. Use 1 AU = 149,600,000 km. DEM = km.arrow_forward
- . If the sun radiates energy at the rate of 4 x 1026 Js-1, what is the rate at which its mass is decreasing? a) 5.54 x 109 kgs-1 b) 4.44 x 109 kgs-1 c) 3.44 x 109 kgs-1 d) 2.44 x 109 kgs-1arrow_forwardgiven: the mass of Sagittarius A* in units of solar masses = 3,832,087.773 MSun. Question: This object is known to be relatively small in size, with a diameter of about 60 million kilometers. For comparison, Earth is 149.6 million kilometers away from the Sun. Based on this fact, what do you think this object is? Hint: The object itself emits virtually no light at all.arrow_forwardConsidering that Earth experiences an average intensity of sunlight of 1330 W/m? and is at a distance from the Sun of 1.0 AU = 150 million km, and considering that that the apparent magnitude of the Sun as seen from Earth is m = -26.7, (a) then how far from the Sun would a distant Kuiper- belt world need to be in order for the apparent magnitude of the Sun to be m = -11.0 as seen on that world? Give your answer in AU. (b) What would be the orbital period of this world? Give your answer in Earth years.arrow_forward
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