From Discovery News:
Every human being that has ever lived could fit inside 1 cubic inch of space at the center of a newly found neutron star, called PSR J0348+0432, located about 7,000 light years from Earth.
But extreme density is not its most unusual feature. The star, which packs about twice the mass of the sun into an object less than 13 miles in diameter, spins around 25 times a second, emitting a steady and detectable radio pulse. Plus, it has a companion close by, a dying star known as a white dwarf, which circles around every 144 minutes.
Assembling the pieces of the system took some time, but when astronomers realized what they had found an idea took shape: Would the pulsar’s extreme gravity cause the pair to move closer together at the rate predicted by physicist Albert Einstein’s long-standing general relativity theory? Or, was this a situation better explained by other models, such as those that tiptoe into the realm of quantum mechanics where the rules of gravity break down?
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“There are many theories about what happens to matter under such extreme conditions,” John Antoniadis, with the Max Planck Institute for Radio Astronomy in Bonn, Germany, told Discovery News.Making the measurements required patience and extreme precision, but in the end the gravitational impact predicted by Einstein’s theory proved correct. In this case, the loss of energy due to gravity waves from the system escaping into space slowed the pair’s orbital period by eight-millionths of a second per year.
What a world, where we can actually detect and measure something slowing by eight-millionths of a second, 7,000 light years from Earth.
