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Space-time Invariance and Quantum Gravity

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**1. **Space-time Invariance and Quantum Gravity
By Dr. Harold Williams
of Montgomery College Planetarium
Title slideTitle slide

**2. **World Lines t for time
x for distance
dx/dt speed

**3. **Space-time At least one space dimension not shown

**4. **World lines, sheets, and volumes of particles, strings, and branes We know we live in a universe with at least 3 space dimensions that we have some freedom in.
Maybe more elaborate structures exist, but we do not as yet perceive them.

**5. **Special Relativity http://en.wikipedia.org/wiki/Special_relativity
http://en.wikipedia.org/wiki/Special_relativity_for_beginners
“Nothing but Relativity” by Palash B. Pal shows that only Galilean and Einstein Relativity are even possible with the “Principle of Relativity”
“Principle of Relativity” = “Physical laws appear the same to any inertial observer.”

**6. **There is a Fastest Speed What ever that fastest speed is nothing can move faster than fastest. c is the fastest speed. Experimentally this, c, is the speed of light, electromagnetic radiation, in a vacuum.