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Time Travel

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by

Ashley Hong

on 21 May 2014

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Transcript of Time Travel

How Time Works
-New Oxford American Dictionary defines time as the indefinite continued progress of existence and events in the past, present, and future regarded as a whole
-We can’t see it or feel it. We have come up with ways to measure time that are totally arbitrary (clocks, calendars, etc.)

Space-Time
-Newton believed in absolute time (separate from space)
-Einstein suggests time and space are intertwined in his Theory of Relativity—known as space-time
-Space-time is warped by matter and energy
-Large bodies warp space-time “blanket”
-Someone will experience space-time differently at various points
-Time is affected by gravity, velocity, energy, momentum

Gravitational Time Dilation
-Difference of time passed between two events measured by observers in different areas of gravitational force
-Time passes slower when the atomic clock is closer to the source of gravity (lower gravitational pull)
-Einstein predicted this in his theory of relativity
-Has been confirmed by general relativity tests
-clocks on trains, planes, satellites
-Twin Paradox (E=mc^2)

Gravitational Time Dilation (cont.)

-Was confirmed directly by Pound-Rebka experiment—gravitational redshift experiment (running clocks)
-Gravitational lensing effect-mass bends light and causes it to refocus somewhere else
-Strong-visible distortions
-Weak-only detected by analysis
*changes velocity of light by bending
*light follows curvature of spacetime
*may result in multiple images
-Shapiro delay
Time Travel
Ashley Hong
Nicole Lee
Sue Park

Time Travel
Moving between different points in time
H.G. Wells
-Born on September 21, 1866, in England
-Accident in 1874 left his leg broken; devoted himself to reading books
-Attended various schools, such as Thomas Morley's Commercial Academy, National School, Midhurst Grammar School,  and the Royal College of Science 
-Wrote many books;  The Time Machine, The Island of Doctor Moreau, The Invisible Man, The War of the Worlds, When the Sleeper Wakes, and more

Space-Time Continuum
- Three dimensions: length, width, depth
- Time is fourth
- Time can't exist without space, & vice versa
- Object in motion experiences time at a slower rate than one at rest

Time Travel Into the Past
-All methods of time travel back onto the past is all theoretical
-Methods
-Wormholes
-White holes
-Black holes

Time Machines
- A machine capable of transporting a person backward or forward in time
- Black Holes, White Holes, Cosmic String
- Wormholes
- Grandfather Paradox

Review
1. Who wrote the Time Machine?
2. What was Einstein's theory about spacetime called?
3. What is time affected by?
4. Explain the twin paradox.
5. Explain E=mc^2
6. Is time travel possible?
-Coined the term “time machine”
-Considered one of the first fathers of science fiction
-One of the first authors to integrate science and logic (or “evidence”) in time travel stories
-The method of time traveling depicted in The Time Machine is the most commonly thought method.
-Thought time as a fourth dimension ten years before Einstein’s theory of relativity was published

H.G. Wells and Time Travel
Time Travel into the Future
-Everyone time travels into the absolute future
-To travel into the distant future
-exploit space-time (gravitational time dilation)
-travel at the speed of light (186,000 miles/s)
-wormholes

Traveling at the Speed of Light
- Speed of light: 700 million miles/ hour
- E=mc^2
- E=energy, m=mass, c=speed of light (constant)
- Faster object moves, greater its mass
- Time dilation
- Time runs more slowly for rapidly moving objects
- High acceleration = high gravitational mass

Answers
1. H.G. Wells
2. Theory of Relativity
3. Gravity, velocity, energy, momentum
4. The twin closer to the source of gravity ages slower
5. E=energy; m=mass; c=speed of light. Energy is directly proportional to mass
6. theoretically by traveling faster than the speed of light; worm holes, black holes, etc.
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