Space Time Laboratory
In fact astronomers have found binary pulsars. And they turn out to twist the fabric of space time into knots.
The two tiny companions orbit each other in a relativistic dance that is a cosmic lab for Einstein’s laws. When the two are closest to each other and their huge gravitational fields combine to be strongest, the stars travel faster and their pulses slow down. In other words, time slows down just as relativity predicts. When the two move further apart, they travel more slowly, and just as relativity says, their pulses speed up.
That’s not all that is happening in the relativistic piece of the cosmos binary pulsars create. As they orbit each other, their orbits shrink over time. The orbits of the first binary pair found are shrinking by about 3.1 mm per orbit. Some 300 million years from now they will bump into each other.
Will they merge, or destroy each other? Or will their extreme gravity and intense magnetic fields cause them to bounce off each other like billiard balls and go careening through the galaxy like banditos on the run from the law?
That apparently has happened. NASA has discovered several runaway neutron stars, presumably former binary pulsars, rushing through the galaxy at breakneck velocities. Some have escaped the galaxy and are headed into intergalactic space. One is headed in our direction at 240,000 mph.
It is not expected to come close enough to the Solar System to have any affect when it swings by 170 lys away 300,000 years from now.
What is the effect on the fabric of space time in their vicinity when these binary pulsars approach each other and dart off into the cosmos, some even leaving the galaxy?
It would certainly be a fascinating space time experiment to see.