21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 5, Problem 37QP
To determine

The distance of the lightbulb from the firefly.

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Astronomers determine that a particular star in our galaxy is moving toward Earth at a speed of 716.0 km/s with respect to the Earth. If Earth receives a wavelength ? = 689.6 nm from this star, what was the wavelength emitted by the star?
The farthest objects in our Universe discovered by modern astronomers are so distant that light emitted by them takes billions of years to reach the Earth. These objects (known as quasars) have many puzzling features, which have not yet been satisfactorily explained. What is the distance in km of a quasar from which light takes 3.0 billion years to reach us ?
Evidence for the Big Bang Theory for the beginning of our universe which is seen by astronomers studying the light which is coming to us from far away quasars and galaxies is that the light is shifted towards the ____________ end of the spectrum in all of those celestial bodies (except the galaxy of Andromeda). This is indicative that those celestial bodies are all (but Andromeda) moving away from us (our point in space). Group of answer choices red green orange ultraviolet blue
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