Weak equivalence principle violated in gravitational waves

The Weak equivalence principle (WEP) is a key aspect of classical physics. It states that when particles are in freefall, the trajectories they follow are entirely independent of their masses. However, it is not yet clear ...

Satellite to test universality of freefall

France's Microscope satellite, carrying a set of ESA high-tech thrusters, lifted off last night from Europe's Spaceport in Kourou, French Guiana, taking advantage of the same Soyuz launch that took the EU's Sentinel-1B into ...

Europe to launch satellites for Earth, Einstein

Europe is set to launch two satellites on Friday with very important missions: one will track environmental damage to Earth, while the other will test a mainstay of physics theory.

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