Here's question from a non-physics mind:
If the Earth, and the galaxy we are in, is hypothetically moving away from the outer limits of known space (in one direction) and the objects in that direction are moving away from us also, and both are travelling at half the speed of light, we would never know it because the light from that distant object (s) will never reach us.
True or false?
False. The light in question originates from some point in space (call it point A) and heads toward earth at the speed of light. Earth starts at some other point in space (point B) and moves away from point A at 1/2 the speed of light. As the light from point A is traveling twice as fast as the Earth the light will catch up to us and we will see it at point C (although Zeno might dispute this point).
I don't have that great knowledge of solid state physics, but that sounds such a cool thing - to discover a new state of matter. All the examples I have heard of over the years have been fascinating.