How do you photograph something that soaks up all light? 🧐
This week, the Event Horizon Telescope collaboration is getting ready to make a major announcement about the Milky Way that has space nerds everywhere on the edge of their seats. Back in 2019, it held a similarly coordinated set of press conferences around the world to reveal the first-ever image of a black hole.
Another way to find a black hole is to look for an accretion disk around the black hole. If a black hole is actively consuming material, like from a companion star, the material forms into a flattened disk around it from its angular momentum around the black hole.
And since radio waves and X-rays are just as much light as the frequencies of the visible spectrum, our sensors and telescopes have everything they need to see the shadow of the event horizon of a black hole. The challenge is to construct a lens large enough to focus the light they receive into a visible image.In the case of radio telescopy, the antenna’s dish acts as the lens, to reflect radio light in a way that focuses the image.
That nearly part is essential because the difference in those streams of data is perhaps more important than the data itself. We are able to map the distances between all of these radio telescopes and mathematically work out how the distance between two points on Earth’s surface should affect the differences in resulting data streams.
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