1037 Albert Einstein and E=mc2

Albert Einstein and E=mc2

I'm reading a book by one of my favourite scientists; it's not exactly an easy read, several passages I had to read twice, but - hey - that's science for you:

Why Does E=mc2? by Brian Cox and Jeff Forshaw 

The Guardian review

Getting to grips with Einstein's famous equation can be a bit of an assault course for the novice, but, says Alok Jha, the reader is in supremely capable hands with Brian Cox and Jeff Forshaw.

Did you know that you're travelling at the speed of light? Not just you: your book, your chair, the room around you, your home. In fact, everything is moving at the speed of light.

Don't feel it? Don't worry, no one else did either until Albert Einstein redefined the substance of reality at the start of the 20th century. 

Neither Galileo, Michael Faraday, James Clerk Maxwell or Isaac Newton knew about the speed of light thing, despite laying the foundations for the insights that the Austrian patent-clerk-turned-physicist would eventually have.

Let me clarify. We are all moving at a speed "c" that happens to correspond with the speed of light as it moves through a vacuum in normal space. Except that our movement is through a 4D co-ordinate system called spacetime. Unlike 3D space, which allows you to measure the position of an object, spacetime allows you to measure events (where and when). 

Even if you are sitting still in 3D space (not moving in any direction), you will nevertheless be moving in 4D spacetime (in other words, no movement in the three space dimensions but moving in the "time" direction).

Click the headline, go to The Guardian, read the article.