One of the things I never fully grasped in college was the ‘Michelson Morley’ experiment. I understood what it was for (proving the constancy of the speed of light) – and understood that it proved that very well – but I never understood the concept of the ether or the ‘ether wind’ or what that […]

# Watching Television while moving Relativistically

Imagine you are in a spaceship moving away from the earth at a velocity v. Imagine that a TV broadcast is sent to your spaceship from Earth. How would you see the broadcast?

Some mathematical preliminaries will help figure out the observed differences.

In terms of the K factor . Reciprocity of K factor means […]

# Solar sails – How do they work?

Light has no mass – yet it can push solar sails. How?

It is true that photons do not have “rest” mass. They do have energy – and hence an associated mass given by m = E/c2. Light has momentum given by p = E/c. In fact, of any body possessing energy E, light has […]