New research suggests that dark energy isn't needed to explain the acceleration in the expansion of the universe — instead ...

When an object changes velocity, it accelerates. Acceleration is the change in velocity per second and is measured in m/s 2. Acceleration is a vector quantity because it has size and direction.

The role of whistler waves is certainly likely to be important, but the exact role in electron acceleration and loss by many other types of waves, and how the solar wind provides the source of ...