Whatever you look at will be history before you ever see it.

The headline may seem something of a strange statement, but it is perfectly true. Whatever we see is already in the past although we may think it is in the present, the here and now. The same is true even for the words that you are reading now, albeit on the screen of a computer of mobile phone will already be part of history before you view them.

Most people understand that light travels at a fantastic speed, about 186,000 miles per second. This means the furthest that can be see, even with the most powerful of telescopes, is some 13.7 billion light years away. This is known as the observable universe. Anything beyond that distance simply cannot be seen, because any light beyond that point will not have sufficient time to reach us.

Sometimes it is a bit mind-boggling to comprehend such vast distances, but if we think in more parochial terms of just our own solar system, we know it takes about 8 minutes for the light emitted from our sun to reach us. That means when we look into the sky during the daytime, the clouds we see are being illuminated by light that is already 8 minutes old, the same as any object we see on the earth.

Condensing these figures into broad understandable terms, it means that if you hold your hand about one foot in front of your face, it takes the light reflected from your hand, about one billionth of a second, known as one Nanosecond to reach your eyes. Although for all intents and purposes we would consider this instantaneous, it still means that a given amount of time has elapsed between the moment you looked at your hand, and before the reflected light from your hand reached your eye. Technically that is now in the past and not the present.

It does not matter what you look at, or how close to your eye something is, a given amount of infinitesimal time will have elapsed before the light reaches your eye.

This means that technically we can never see the present, only the past.

Universe or Multiverse?

The Universe is so called due to mankind’s somewhat arrogant assumption that  there cannot be more than one universe and that the universe fills the heavens as far as the eye can see. I suppose that was not too unreasonable an assumption in times when mankind’s knowledge was more limited. Mankind however is rather like a worm in a hole whose knowledge about it’s surroundings is limited by what it can see through the top of the hole. As the worm gradually emerges from it’s hole, it can see more detailed surroundings that it never knew existed before. Mankind is in a not dissimilar position and as our knowledge of the universe expands, so do our thoughts on possibilities we had never considered before. Continue reading

Does Time Exist – The eternal question?

Have you ever really thought about time, not in terms of whether you have enough of it but if time really exists? When most of us think about time, what is really going through ours minds is a man-made concept for measuring a period that has elapsed between one event and another. The start and end of a race, the beginning and end of a journey, how long since the universe was created down to how long it took the kettle to boil. All of these are a few of the many millions of ways that we measure the man-made concept of elapsed time every day. Continue reading

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