Advances in astronomical observation over the past century have allowed scientists to construct a remarkably successful model of how the cosmos works. It makes sense – the better we can measure something, the more we learn.

But when it comes to the question of how fast our universe is expanding, some new cosmological measurements are making us ever more confused. Since the 1920s we’ve known that the universe is expanding – the more distant a galaxy is, the faster it is moving away from us. In fact, in the 1990s, the rate of expansion was found to be accelerating. The…

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