# Is it possible for two instantaneous events, one predicated on the other, to happen at the exact same time?

According to Einstein’s special theory of relativity, it is impossible to say in an absolute sense that two distinct events occur at the same time if those events are separated in space.

## Can two things occur at the same time?

Is it possible for two events happen at the exact same time? No. Even at any one event itself there can be several (or in though-experimental principle even arbitrarily many) distinct participants (encountering and passing each other, momentarily).

## Do any two observers always agree on simultaneity of events Why?

Two observers in relative motion will agree that two events are simultaneous: Two observers in relative motion will agree that two events are simultaneous: Never since they are both moving. Always only if they occur at the same time.

## What do you mean by simultaneity of two events?

According to Einstein’s definition of simultaneity, two events are simultaneous in a given system of reference, if they occur at the same time, as measured by clocks that have been synchronized using light signals.

## Does simultaneity exist?

No, there is no absolute agreement on simultaneity. Alpha Centauri is about three light years from us. We know that it existed three years ago because we can see it in the sky as it was, for us, three years ago.

## What is twin paradox theory?

In physics, the twin paradox is a thought experiment in special relativity involving identical twins, one of whom makes a journey into space in a high-speed rocket and returns home to find that the twin who remained on Earth has aged more.

## Will it be possible for a moving person to observe two events happening simultaneously with respect to inertial frame given that another person?

Answer and Explanation: From the special theory of relativity two events which are observed simultaneous in one inertial frame of reference may not be simultaneous in other frame of reference.

## Is there a universal now?

However, there is no universal “now”. This is covered by Special Relativity, the relativity of simultaneity. Different observers will disagree on whether two event are simultaneous. Over large distances time and space become interwined, to simplify, with spacetime intervals.

## Is it possible that they may not be simultaneous in a different inertial frame?

Events that are simultaneous in one inertial frame can never be simultaneous in another different inertial frame.

## Under what condition will two events at different locations be simultaneous in both frames?

In order for the two events to be simultaneous in frame S′, they must be both be on its x′-axis, so, the only way it can be simultaneous for both observers is if S and S′ are not moving relative to eachother so that their worldlines are parallel.

## Does the past still exist?

In short, space-time would contain the entire history of reality, with each past, present or future event occupying a clearly determined place in it, from the very beginning and for ever. The past would therefore still exist, just as the future already exists, but somewhere other than where we are now present.

## Is present time an illusion?

According to theoretical physicist Carlo Rovelli, time is an illusion: our naive perception of its flow doesn’t correspond to physical reality. Indeed, as Rovelli argues in The Order of Time, much more is illusory, including Isaac Newton’s picture of a universally ticking clock.

## Does the now exist?

In fact, mathematically, we define the now as a single point in time. This point is an abstraction and, believe it or not, it has no duration. Ergo, mathematically, the present is a point in time with no duration: the present doesn’t exist!

## Is our future already written?

The future, though it remains unknown to you, seems to be written already. Einstein himself described it thus: “People like us, who believe in physics, know that the distinction between past, present and future is only a stubbornly persistent illusion.”

## Is time the 4th dimension?

According to Einstein , you need to describe where you are not only in three-dimensional space — length, width and height — but also in time. Time is the fourth dimension. So to know where you are, you have to know what time it is.

## Is time Travelling possible?

General relativity. Time travel to the past is theoretically possible in certain general relativity spacetime geometries that permit traveling faster than the speed of light, such as cosmic strings, traversable wormholes, and Alcubierre drives.

## Can a wormhole exist?

Einstein’s theory of general relativity mathematically predicts the existence of wormholes, but none have been discovered to date. A negative mass wormhole might be spotted by the way its gravity affects light that passes by.

## Can you time travel with your mind?

Do you believe in time travel? Every time we remember something from the past or imagine something that will happen in the future, we engage in mental time travel. Scientists discovered that, whether we mentally travel back into the past or forward into the future, some of the same brain regions are activated.