Does time have a beginning? The Big Bang thought that time and space had a beginning, while other scientists pointed out that the time scale had no instantaneous beginning. So does time have a beginning?
How do we describe time? We use moments to describe time. What time is it? The time interval between the beginning and the end is time. What we usually call time is time interval. The time interval between any two moments is time. We can call one moment the beginning and the other the end.
The movement process of matter is time. How long does it take for an object to move? This requires a unit of time, just like describing space. For example, how long is a meter? Then we can use this unit of measurement to describe space, specifically, the spatial length of object movement. How many times or a fraction of a meter does an object have to walk from the starting point to the end point? We specify a unit of time, such as seconds. Then we can use this unit of measurement to describe time. The time interval between the start and end of an object's motion is the time required for the object's motion.
The speed of an object is relative to the time interval (that is, time), not to the moment. Objects are at rest in space at all times. The motion of an object is relative to the time interval. We can say that an object is at a certain point in space at a certain moment, and an object is in space at any moment and stands still at a certain point in space. We can't say that an object is moving in space at a certain moment. The motion of an object is relative to the time interval.
The position of an object in space. If an object is always at rest. After a period of time, the object is still in its original position. This period of time can be very long, such as10 million years; This time can also be very short, such as one thousandth of a second. For this object, the beginning moment of the object is the end moment of the object. We can think that the time spent by an object is zero, that is, time is static. Generally speaking, an instant cannot contain time. It's different here. Time turned into an instant. That is to say, when an object is still in space, or all objects are still in space, time is still. It doesn't matter when. Here we can say that time has become an instant, and in this instant, the object is still in space. However, when an object moves, it is different. The motion of an object marks the beginning of time, or the beginning of time can be calculated. The moment an object begins to move, it is the beginning of calculating time.
All frames of reference are equal. When a frame of reference is used to describe the motion of another object, the motion state of the other object is the difference between the motion states of the two objects. When another object is used to describe the frame of reference, this difference is constant. For example: two objects, these two objects can be just two objects in space or two objects among many objects. Two objects a and b, a is at rest and b is at rest. A sees B at rest, and B sees A at rest. A is stationary and B is moving in a straight line at a constant speed. A sees B moving in a straight line at a constant speed, and B sees A moving in a straight line at a constant speed. A is stationary and B is accelerating. A sees B accelerating, and B sees A accelerating.
All directions of space are equal. The motion of an object at any point in space is outward motion with that point as the origin. Includes that the object moves a certain distance and then returns to the original point. (At this time, take the return place as the origin and move outward. We can call it the extroversion of objects moving in space. The start time and end time of the object motion determine the time interval of the object motion, that is, the motion time of the object. The outward movement of an object in space determines the time when the object moves forward.
Time is invisible, but we can perceive the existence of time through the movement of objects. The movement of an object in space, the distance between movements is the distance between two points in space. We can specify the unit of space to represent the size of this interval.
It takes time for an object to move in space. No matter how far the space is, no matter how fast the object moves, it takes time.
An object can only be at a certain point in space at a certain moment. If an object is at one point in space, it cannot be at another point in space at the same time.
For a stationary object, time becomes an instant; For a moving object, only when the object moves can there be time. It is different to look at a stationary object with a moving object. In the eyes of a moving object, the time required for a stationary object to move in a stationary object is the time from the beginning to the end of the movement of the moving object.
If all objects are at rest, we can say that time is at rest. When an object is at rest and the surrounding objects are moving, we can't say that time is at rest. Where there is exercise, there is time. Where there is movement, there is time interval. Usually, what we call time has two meanings. How long the time interval is, it is called time; What time refers to the present. Time interval is a part of time.
When an object moves from one point to another in space, there is a time interval from a certain moment corresponding to the movement of the object to another moment corresponding to the end of the movement of the object, that is, the time taken for the movement of the object. It is also a time in time.
The outward movement of an object at any point in space shows the progress of time from one moment to another. Because of the outward movement of objects, time can only go forward. The unidirectional outward movement of an object determines that time can only move forward.
Exercise keeps going, time keeps going. Time here is determined by exercise. Motion here refers to the motion of all objects, and non-stop motion means that as long as one object moves, it will not stop.
Individual objects are static, and time is not static. Because other objects are moving. The object is at rest and time becomes an instant, so we can't describe time; The motion of an object determines that we can describe the motion of time. The movement of objects in space and the outward movement of objects determine the forward and uninterrupted nature of time. The uninterrupted motion of an object determines the uninterrupted time. The intermittent motion of a single object does not affect time. That is, there is no time gap.
What is the time s in the speed of light relative to?
Simultaneous relativity means that the motion of an object (the motion of light) ends at different times. There is no question of starting at the same time or starting at the same time.
The movement does not end at the same time, but is brought into the relativity of time. The relativity of time is conditional. The light seen by observers in different reference systems will not arrive at the same time, will it?
The time taken by any object to move is a part of time, and a part of time is the time interval between two moments in time.
When an object moves, the movement in different directions, including returning to the origin, is the outward movement of the object at any point in space. Time is related to space, but it cannot be expressed by space. In other words, not a point in space corresponds to an instant in time. We can express time by the motion of an object in space. It can be uniform linear motion or circular motion.
Assume that all objects are at rest at first. Time begins when objects begin to move. If an object has moved to the present, then the time from this object to the present is the time of all objects. Among them, no matter whether a single object is still after moving, it moves again after being still; Or some objects are static until now; The time of an object is this time. The moment when other objects are in a certain position in space is the moment when objects are at a certain point in space.