Will we ever be able to time-travel?

analogue_clock

Time is something we all use throughout our lives, although many of us probably don’t think about how it work – we just get on with it!

Us humans divide time up into small chunks, like hours and minutes and seconds; or into bigger chunks, like days, weeks, months and years. And we measure time by looking at clocks or watches or calendars.

Animals and plants and other creatures also measure time but they don’t use clocks – they rely on the amount of light to tell if it’s day or night, and they sense more gradual changes in the seasons.

Time-travel, or the ability to move backwards or forwards through time, is an idea that pops up in stories and films. But could it actually happen?

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Why does a clock only have 12 numbers?

analogue_clock

Human beings have been thinking about and counting time for thousands of years. The first time-keeping machines used sand, water or the position of the Sun in the sky to mark out the passage of time. These days, we use clocks and watches for telling the time. But however we do it, our measurement of time is based on the movement of our planet Earth in relation to the Sun.

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