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This artist’s image depicts part of a model of Earth’s tree of life. When humans finally discover alien life, will they be able to recognize it? Astrobiologists are developing a

Do primordial black holes exist? Scientists haven’t found them yet, but they’ve theorized about them for decades. They would have formed while the universe was rapidly expanding after the Big

Scientists have just reported they’ve found more evidence the universe is vibrating in the form of a gravitational wave background. Image via Carl Knox/ OzGrav/ Swinburne University of Technology and