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Though it is known that black holes draw in everything nearby, it will be the first chance to see one consume such a cloud.
As it is torn apart, the turbulent area around the black hole will become unusually bright, giving astronomers a chance to learn more about it.
Researchers using the European Southern Observatory's Very Large Telescope estimate that despite its size, the cloud has a total mass of only about three times that of Earth.
They have plotted the cloud's squashed, oval-shaped path and estimate it has doubled its speed in the last seven years - to 2,350km per second.
"The most exciting thing we now see in the new observations is the head of the cloud coming back towards us at more than 10 million km/h along the orbit - about 1% of the speed of light," said Reinhard Genzel, from the Max Planck Institute for Extraterrestrial Physics in Germany. "This means that the front end of the cloud has already made its closest approach to the black hole."
For cosmic detectives across the Earth, it is a unique opportunity.
For the first time in the history of science, they hope to observe in action the awesome spectacle of a feeding supermassive black hole.