Does time really exist, or is it a persistent illusion?

By Daryl Janzen, Observatory Manager and Instructor, Astronomy, University of Saskatchewan

Imagine you are sitting on a train, moving at a constant speed. The blinds are drawn so you can’t tell you are moving. A light bulb hangs on a chain in the centre of the car. When someone turns it on, your human eye perceives the whole carriage lighting up.

What actually happens is that light first reaches the two sides of the car simultaneously. A moment later, the light reaches the front and back of the car, again simultaneously. The light has travelled at the exact same speed in all four directions.

Albert Einstein…

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