A team of researchers, engineers, and physicists recently gathered at Harvard to begin planning on the Event Horizon Explorer (EHE). This $300 million space mission builds on the success of the 2019 Event Horizon Telescope (EHT) project.
This space observatory would allow astronomers to take sharper images of black holes than the EHT.
EHE images would be able to show photon rings formed by particles moving rapidly around a black hole. “We [currently] can’t see those in the EHT images. They’re too narrow to distinguish from the rest of the light near a black hole,” he added.The study of photon rings may give information on the behavior of the black holes that lurk at the heart of each galaxy. It may, for example, offer evidence of the spinning of black holes.
“If a black hole is spinning, it would distort the shape of the photon ring, squeezing it into an oval,” said Peter Galison, Joseph Pellegrino University Professor in the History of Science and Physics and director of Harvard’s Black Hole Initiative.Galison stated that if EHE is successful in measuring the photon ring then “that will be a rock-solid measurement of the effects of the rotating black hole to bend the path of light itself.
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