Two mathematicians have proved that a straightforward question — how hard is it to untie a knot? — has a complicated answer.
In a recent piece for my column The Universe, I wrote about the biggest black holes in the cosmos. Black holes are rather ...
Gauging the mass of a black hole is tricky, but astronomers have devised multiple methods to measure the heft of these galactic gluttons ...
For scientists, learning more about how black holes behave is essential to understanding how the universe works. A recent ...
The Hongmeng Smart Mobility Autumn Launch Event was held on September 23, officially introducing the new member Shangjie H5 ...
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