COSMIC PERSP.FUND.-MASTERING ASTRONOMY
COSMIC PERSP.FUND.-MASTERING ASTRONOMY
3rd Edition
ISBN: 9780134989273
Author: Bennett
Publisher: PEARSON
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Chapter 1, Problem 4QQ

Choose the best answer to each of the following. Explain your reasoning.

The star Beteigeuse is about 600 light-years away. If it explodes tonight (a) we’ll know because it will be brighter than the full Moon. (b) we’ll know because debris from the explosion will rain down on us from space. (c) we won’t know about it until about 600 years from now.

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Please help me answer part A and B
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Explain what is meant by the distance ladder in astronomy. Describe briefly how each “rung” of the distance ladder is calibrated so that a reliable measure of distance can be obtained using each of the methods. State clearly the range of distances that can be measured by each method that makes up the distance ladder.
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General Relativity: The Curvature of Spacetime; Author: Professor Dave Explains;https://www.youtube.com/watch?v=R7V3koyL7Mc;License: Standard YouTube License, CC-BY