In the above graph of a pulsar in a binary, the motion of the pulsar from 2.75 hours to 3.5 hours is ___________________.

Question

Quizplus · Accepted Answer

From 2.75 hours to 3.5 hours, the pulsar is moving towards Earth, as evidenced by the decrease in the observed pulse arrival times (i.e. the pulse frequency appears to be increasing as the pulsar approaches us). This is known as a blue shift, indicating motion towards the observer.

In the Above Graph of a Pulsar in a Binary