Estimate when the two galaxies will collide
Given the galaxies' present separation of 800 kpc, and neglecting both the transverse component of the velocity and the effect of gravity in accelerating the motion, estimate when the two galaxies will collide.
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On a workday the average decibel level of a busy street is 82 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 15 every minute on a weekend, what is the decibel level of the street?
Neglecting both the transverse component of the velocity and the effect of gravity in accelerating the motion, estimate when the two galaxies will collide.
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