SpaceWhere does space begin? Here's why it's closer than you think The jump from Earth to space is often thought to happen 100 kilometres up, but it's time to think again and bring the boundary closer to home, says Jonathan McDowell Comment
Physics‘Impossible’ EM drive doesn’t seem to work after all A rocket engine propelled by electromagnetic waves grabbed headlines, but new tests find the EM drive may actually be driven by Earth’s magnetic field News