TIME

We've always structured our lives based on an unchanging past and a predictable and ordered future. But atomic and cosmic discoveries have changed all that. What is time itself? And will it ever end?

Michio Kaku taks about the nature of time
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Pale Blue Dot

carl sagan-
"Those worlds in space are as countless as all the grains of sand on all the beaches of the earth. Each of those worlds is as real as ours and every one of them is a succession of incidents, events, occurrences which influence its future. Countless worlds, numberless moments, an immensity of space and time. And our small planet at this moment, here we face a critical branch point in history, what we do with our world, right now, will propagate down through the centuries and powerfully affect the destiny of our descendants, it is well within our power to destroy our civilisation and perhaps our species as well."

4th Dimesion for Dummies

In physics and mathematics, a sequence of n numbers can be understood as a location in an n-dimensional space. When n = 4, the set of all such locations is called 4-dimensional Euclidean space.

Such a space differs from our more familiar three-dimensional space in that it has an additional dimension, indistinguishable from the other three. This fourth spatial dimension is a concept distinct from the time dimension in spacetime, since time is functionally very different from any of the spatial dimensions; formally, spacetime is not an Euclidean space but a Minkowski space.

Carl Sagan explains the concept of the 4th dimension in easy to understand terms.

COSMOS by carl sagan

Cosmos was the first science TV blockbuster, and Carl Sagan was its (human) star. By the time of Sagan's death in 1996, the series had been seen by half a billion people; Sagan was perhaps the best-known scientist on the planet. Sagan's own interest and enthusiasm for the universe were so vivid and infectious, his screen presence so engaging, that viewers and readers couldn't help but be caught up in his vision
Watch Carl Sagan's Cosmos, Part 1 in Entertainment | View More Free Videos Online at Veoh.com