Say hello to Sagittarius A*, the black hole at the center of the Milky Way galaxy

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Chris Impey, an astronomer at the University of Arizona, explains how the team got this image and why it is such a big deal.

to collect data on the black hole over the course of five nights in 2017. Every night generated so much data that the team couldn’t send it through the internet – they had to ship physical hard drives to where they processed the data.

Because black holes are so hard to see, there is a lot of uncertainty in the data the telescopes collect. To turn it all into an accurate image, team used, each one a mathematically viable version of the black hole based off the data collected and the laws of physics. They then blended all of these images together to produce the final, beautiful, accurate image. The processing time was equivalent to running 2,000 laptops at full speed for a year.

– this one at the center of the galaxy M87. The black hole at the center of this galaxy, named M87*, is a behemoth 2,000 times larger than Sagittarius A* and 7 billion times the mass of the Sun. But because Sagittarius A* is 2,000 times closer to Earth than M87*, the Event Horizon Telescope was able to observe both black holes at a similar resolution – giving astronomers a chance to learn about the universe by comparing the two.

M87*, on the left, is 2,000 times bigger than Sagittarius A*, on the right. The thin white circles indicate sizes of orbits of planets in the solar system.

 

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