Understanding Our Universe
Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 15, Problem 45QAP
To determine

The distance of photon and cosmic ray after 100 million years.

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A spaceship is moving between two distant stars at 0.802c. To someone in the ship, the distance between the two stars appears to be 29.2 light yrs. What is the distance between the stars in the rest frame of the stars in light years? Give your numerical answer with one decimal place please.
A star is 80 light years from Earth. How fast does a spacecraft have to be for the journey to last the 70 years of an astronaut's life? The answer is 0,7526c. Show a complete approach on how to get to the answer by using the necessary equations.
Suppose you decide to travel to a star 85 light-years away at a speed that tells you the distance is only 25 light-years. How much is that speed?
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