Trains and high speeds
Twin paradox
Faster than light communication?
Is time travel possible?
Faster than light signals
Causal ordering postulate
Conversion factor
Proper distance
4-D projected onto 3-D and time
All objects are 4 dimensional
Let's take a trip
As seen from Earth
Space time view
At rest?
What about accelerated motion?
Relativity changes Newton's gravity
Perihelion shift of Mercury
Accelerated frame
Why are astronauts weightless?
The principle of equivalence
Thought Experiment 1
Thought Experiment 2
Gavitational Time dialation
Clocks
Tidal force
The closer the stronger
Things get pulled toward Earth's center
Why did Einstein fail?
