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# Special Relativity

## Get up to (light) speed on Einstein's theory of relativity.

Beginning with famous thought experiments and a few intuitive principles from Newtonian mechanics, this course closely follows Einstein's arguments leading to the epiphany that time and space are a single entity, spacetime, where physical processes unfold.

After gaining experience with the mathematical machinery of relativistic physics, you will open the door to high-energy phenomena and Einstein's famous relationship, E = mc2. In the end this course will boost you to the cusp of the most elegant of physical theories: general relativity.

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1. 1

### Reference Frames and Observers

Let there be light... and observers.

1. #### Relative Motion of Observers

Refresh yourself on reference frames and relative speeds on the high seas.

2. #### Propagation of Light

Retrace the steps of the first measurement of the speed of light.

3. #### The Mystery of the Luminiferous Aether

How Michaelson and Morley used light to prove that space is empty after all.

4. #### Einstein's Postulates

Can two events ever be simultaneous to all observers?

2. 2

Face reality in four-dimensional spacetime.

1. Included with

#### Cosmic Ray Muons

One of the most basic tests of relativity is raining down around you constantly.

2. Included with

#### Spacetime Intervals and Causality

Could faster-than-light particles send information back in time?

3. Included with

Can a deep-space voyage put years between two identical twins?

4. Included with

#### Rotations in Spacetime

A different perspective on Lorentz transformations can simplify some difficult problems.

3. 3

### Energy and Dynamics

A high-energy ride on the particle safari.

1. Included with

#### Four-Velocity

Four-dimensional Space Invaders is a much harder game.

2. Included with

#### Energy-Momentum Conservation

You rely on conservation of 4-momentum and energy each and every day.

3. Included with

#### High-Energy Particles

Understand the invisible ballet of particle decay that bombards the Earth with cosmic rays

4. Included with

#### Photons

A moving light source is a brighter light source.

4. 4

### Accelerated Observers

Interstellar travel, global positioning satellites, and everything in between.

Coming Soon
5. 5

### Spacetime and Geometry

Matter tells spacetime how to curve, spacetime tells matter how to move.

Coming Soon