From Popular Science:
A Star Just Got Swallowed By A Warp In Space-Time
A star has slipped out of view thanks to the space-time warp it creates as it orbits.
The disappearing star is part of a binary star system called J1906. It's a pulsar, which means it's a rotating neutron star, the result of a massive star collapsing in on itself. Researchers have been studying the young pulsar for five years to determine what kind of companion star was orbiting around it. That is, until recently, when the pulsar vanished.
As a pulsar rotates, it emits a beam of electromagnetic radiation, sort of like light coming from a lighthouse. Scientists use radio telescopes that pick up on the pulses coming from the star. But as scientists watched J1906, the pulsar began to slip off the radar. It seems that as the pulsar spins around its companion star, the mass of the companion star makes it sink into a dip in space-time, so that its radio waves can no longer reach Earth. The concept is called geodetic precession, which, according to NASA, uses Einstein’s theory of relativity to understand how massive objects like the Earth curve the space around them, influencing the local space-time fabric.
They have an animation of the precession here:
Precession is what makes a gyroscope wobble around when it is spinning.
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