Gravity is one of the universe's great mysteries. We decided to find out why.
Think you know what gravity is? Think again. New research is revealing how little we know about this most mysterious of forces.
New window on the universe is opened with the observation of gravitational waves – ripples in spacetime – caused by the collision of two black holes.
Don’t miss the chance to quiz leading scientists from the Planck research team about their work, and how it may change our understanding of the universe, in a live webcast this week
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