Relativity is such a beautiful thing…

If two spaceships are moving toward each other at 5 m/s which is moving…

To a outside observer, the are both moving toward each other, each at 5m/s

To the observer on spaceship A, (A) appears to be motionless, and Spaceship B is moving towards it at 10m/s

To the observer on spaceship B, B appears to be motionless, and Spaceship A is moving towards it at 10m/s

Relativity is a beautiful thing…

All three are true…

An observer on earth can, legitimately based on relativity, say that every thing revolves around the earth. And, from the perspective of the observer on Earth, he is right. TO an observer on Mars, Earth revolves around the sun.

Again, both based on relativistic points of view are correct.

I can, in theory, say the universe revolves around me…

The problem is, there is no set universal fixed point, everything moves with respect to everything else.

An object could be moving in a local star group at only 100 mph, but to us, it could be moving away at nearly the speed of light…

I know it confuses matters, but, No one can say one or the other is the perfect answer (that was actually part of Galileo’s problem, he insisted his model was perfect and that the Church accept it. The Church had no problem with his model, just his assertion that it is perfect.)

Hope that helps

In Christ