チャンドラX線観測衛星がブラックホールのスピンを測定…

チャンドラX線観測衛星(Chandra X-ray Observatory)がブラックホールのスピンを測定したようです。

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A Quick Look at ASASSN14-li Chandra X-ray Observatory

In a galaxy about 290 million light years from Earth, a star wandered too close to a black hole. 

The immense gravitational forces of the black hole shredded the star, sending the stellar remains into orbit around it.

Scientists used several telescopes including NASA's Chandra X-ray Observatory to study this "tidal disruption" event called ASASSN-14li.

They were able to use the data to measure the spin of the giant black hole at the center of the galaxy containing ASASSN-14li.

The scientists determined that the black hole in ASASSN-14li is spinning incredibly quickly — about half as fast as the speed of light or faster.

Since the spins of black holes have been difficult to measure, this discovery is exciting for astronomers.