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Scientists also hope to see new types of events, such as mergers of a neutron star and a black hole, which theory suggests are rare.Supernova explosions of individual stars in our Milky Way galaxy should also produce detectable gravitational waves, which could help astrophysicists figure out exactly how the stars blow up.“It’s been superexciting to see something that was just an idea come to life,” says Daniel Kasen of the University of California, Berkeley, who has modeled kilonovas.“All this stuff was done basically with eyes-closed theory.” The observation even bolstered Albert Einstein’s general theory of relativity by confirming that gravitational waves travel at the same speed as light and not more slowly, as some alternative theories had predicted.And the reddish afterglow fit the model of a so-called kilonova, in which neutron-rich matter flung into space by colliding neutron stars hosts a chain of nuclear interactions known as the r-process.The process is thought to produce half the elements heavier than iron, and the heaviest ones would soak up blue light, tinting the glowing radioactive cloud red.Over several days, the source faded from bright blue to dimmer red.Then, after 11 days, it began to glow in x-rays and radio waves.

Especially remarkable was the way the event was spotted: by detecting the infinitesimal ripples in space itself, called gravitational waves, that the spiraling neutron stars radiated before they merged.Astrophysicists want to know how stiff or squishy neutron star matter is—a property encapsulated in the so-called equation of state.In principle, the gravitational waves can reveal that information: The stiffer the matter is, the larger the neutron stars will be, and the earlier they will tear each other apart as they spiral together, altering the signal.But at about 500 cycles per second, the waves’ frequency climbed out of LIGO’s sensitivity range, and the detectors couldn’t observe the final few revolutions leading up to the merger.

Those final revolutions could provide insights into the nature of neutron stars, orbs of pure nuclear matter slightly more massive than the sun but just 20 to 30 kilometers wide.They would also like to see the gravitational waves right up to the point at which the neutron stars spiral into each other.



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