We turned the galaxy into our own little science experiment to prove Einstein right.
. They are produced by accelerating masses and can be used to study objects like black hole binaries which do not emit visible light. Our experiment is sensitive to low-frequency gravitational waves with periods of years to decades.Think of it as a bell, Hughes explained. The pitch of a bell depends on its size. The smaller it is, the higher pitch it will sound. The bigger it is, the lower the pitch.
That’s the idea behind the pulsar timing array, an effort by NANOGrav to observe and collect data from 58 pulsars throughout the Milky Way. Over time, astronomers watched for variations that would indicate that there are gravitational waves that have been generated by distant supermassive binary black holes passing through our galaxy.Neutron stars are the collapsed cores of massive stars which have ended their lives in cataclysmic supernova explosions.
This is what astronomers are trying to do with gravitational waves by way of the gravitational wave background. From this hum, scientists have already been able to gain insights into questions about black holes that have plagued them for years. For example, before these insights, astronomers weren’t sure whether or not supermassive binary black holes orbited one another forever without actually merging and creating a gravitational wave.
The 100-meter Green Bank Telescope, the world's largest fully steerable telescope and a core instrument for our pulsar timing array experiment.However, as scientists learn more about gravitational waves and refine the instruments used in the pulsar timing array, they’ll get better at listening in that crowded room. Instead of just hearing the din of conversations, they’ll be able to zero in on conversations or listen to individual voices.
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