Scientists have discovered that the hottest and brightest stars in the cosmos, blue supergiants, are created when two smaller stars spiral together and merge, new research suggests.
Some 13.8 billion years ago, the universe began with a rapid expansion we call the big bang. After this initial expansion, which lasted a fraction of a second, gravity started to slow the universe down. But the cosmos wouldn’t stay this way. Nine billion years after the universe began, its expansion started to speed up, […]
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