What does the Event Horizon Telescope have in store for us over the next few years?
The M87 black hole's sheer size actually helps when it comes to making movies. Because Sagittarius A* is much smaller, changes occur much more quickly as gas whips around the black hole — too quickly for sporadic observing by the EHT to track. Because M87's black hole is so huge, changes in its gas ring take weeks or months to become apparent, allowing movies to be captured at a more stately pace.
Although we shouldn't expect any movies of Sagittarius A* anytime soon, there's plenty more to observe there in the meantime. The EHT has already measured the level of, which tells astronomers about the strength and direction of magnetic fields wrapped up in the disk, possibly emanating from the black hole itself.
The Event Horizon Telescope operates through Very Long Baseline Interferometry, a technique that pairs off telescopes. The distance between the telescopes, which scientists call the 'baseline,' is equivalent to the aperture of a normal telescope.
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