What is the fine-grained topic of the following text: It’s that shadow that the EHT will be looking for, using a synchronized network of radio telescopes spanning the globe, beginning in Spring of 2017 with the first attempt to image the 4-million-solar-mass black hole that’s 25,000 light years away in the center of our galaxy – the equivalent of trying to see your favorite citrus fruit on the surface of the moon. Only return the topic.
Imaging the black hole at the center of our galaxy using a global network of radio telescopes.