Portal:Physics/Did you know/5


 * ... the mirage of astronomical objects is an optical phenomenon, which produces distorted or multiple images of astronomical objects such as the Sun, the Moon, the planets, bright stars and very bright comets


 * ... that your watch would run slower when orbiting a black hole than it would on Earth?


 * ... that homing pigeons wouldn't be able to navigate on Mercury because the planet has no magnetic field or atmosphere?