Question

how was time started? ​

Answer 1

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The measurement of time began with the invention of sundials in ancient Egypt some time prior to 1500 B.C. However, the time the Egyptians measured was not the same as the time today's clocks measure. For the Egyptians, and indeed for a further three millennia, the basic unit of time was the period of daylight.

Step-by-step explanation:

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Answer 2

The measurement of time began with the invention of sundials in ancient Egypt some time prior to 1500 B.C. However, the time the Egyptians measured was not the same as the time today's clocks measure. For the Egyptians, and indeed for a further three millennia, the basic unit of time was the period of daylight.

When we look at the Universe today, we know with an extraordinary amount of scientific certainty that it wasn't simply created as-is, but evolved to its present configuration over billions of years of cosmic history. We can use what we see today, both nearby and at great distances, to extrapolate what the Universe was like a long time ago, and to understand how it came to be the way it is now.

When we think about our cosmic origins, then, it's only human to ask the most fundamental of all possible questions: where did this all come from? It's been more than half a century since the first robust and unique predictions of the Big Bang were confirmed, leading to our modern picture of a Universe that began from a hot, dense state some 13.8 billion years ago. But in our quest for the beginning, we know already that time couldn't have started with the Big Bang. In fact, it might not have had a beginning at all.

Whenever we think about anything, we apply our very human logic to it. If we want to know where the Big Bang came from, we describe it in the best terms we can, and then theorize about what could have caused it and set it up. We look for evidence to help us understand the Big Bang's beginnings. After all, that's where everything comes from: from the process that gave it its start.

But this assumes something that may not be true about our Universe: that it actually had a beginning. For a long time, scientifically, we didn't know whether this was true or not. Did the Universe have a beginning, or a time before which nothing existed? Or did the Universe exist for an eternity, like an infinite line extending in both directions? Or, quite possibly, is our Universe cyclic like the circumference of a circle, where it repeats over and over indefinitely?

For a time, there were multiple competing ideas which were all consistent with the observations we had.

An expanding Universe could have originated from a singular point — an event in spacetime — where all of space and time emerged from a singularity.
The Universe could be expanding today because it was contracting in the past, and will contract again in the future, presenting an oscillating solution.
Finally, the expanding Universe could have been an eternal state, where space is expanding now and always had been and always would be, where new matter is continuously created to keep the density constant.
These three examples represent the three major options: the Universe had a singular beginning, the Universe is cyclical in nature, or the Universe has always existed. In the 1960s, however, a low-level of microwave radiation was found everywhere across the sky, changing the story forever.



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