A Black Hole Close-Up, and a Telescope as Big as the World

The Event Horizon Telescope will give astronomers an extreme close-up when our galaxy's black hole lights up. 

black-hole
The giant black hole in the middle of our galaxy stays pretty quiet most of the time, flaring up only occasionally. But it is due for a burst of activity any day now, as a large cloud of gas and dust continues to spiral toward the heart of the Milky Way.  With this sudden influx of material, the normally tranquil black hole — named Sagittarius A* (pronounced "A star") and as massive as 4 million suns — will roar to life, unleashing a fiery discharge of matter and radiation. ...
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