Work against gravity.
12000 Lunar Orbits/Earth Day.
Highest speed in free-fall.
Causes the sky to appear blue.
All matter is in pairs.
Smallest particle is a string.
Carries God's name in Arabic.
Invisible spectrum.
Time slows in gravity/acceleration.
For transportation.
Black Holes.
Curvature of spacetime.
Mass curves spacetime.
Copper used in armor-piercing.
Ripples in spacetime.
Incapacitate or kill.
Vibration of strings.
Mass in extra dimensions.
Acceleration is equivalent to gravity.
Expansion of universe stretches light waves.
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