Check this out:
https://phys.org/news/2020-03-pulsating-star.html
The tl;dr:
Pulsars with a close orbiting binary companion may pulse only in one direction because of the gravity of the other star. It's been theorized, but now we know.
(Pulsars may be vital for interstellar navigation and a one-sided one may be particularly useful! You could use it to line up on...)
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