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Einstein’s theory of general relativity has survived another demanding test. Researchers used clouds of ultracold atoms aboard China’s space station to compare how two forms of rubidium respond to gravity,…
Astronomers have found a faint star taking an extraordinary route around the black hole at the centre of the Milky Way. The star, named S301, reaches about 25,000 kilometres per…
What exactly is reality? And how do we define it? Is everything around us real? Or are we living inside a simulated universe? There have been revealing papers that have…