If two rays of light in opposite directions are emitted at the same time, after a year, is the dista

Yes, two light years. Relative to the reference frame of the observer (in this case, the observer with static mass) is located, after one year, the observer is 1 light-year away from the first light-year, and the second light-year is 1 light-year, and the addition is equal to 2 light-years. There is no problem, do not be misled by those who do not understand the theory of relativity.

Where are you from your point of view? Your question could be better formulated. On a spaceship traveling at the speed of light, shoot a trickle of light in the direction of the head. Can this beam of light add up to the speed of the spacecraft, twice the speed of light? No. It's still twice the speed of light.

There are all kinds of explanations. It's either cumbersome or wrong.

The most concise and easy-to-understand explanation is this, we call this kind of system that can accumulate velocities as an inertial system. Light-speed spacecraft can add up velocity to objects with mass, but light (photons, to be precise) has no mass, no inertia. So the velocity of the spacecraft cannot be transferred to the photons.

So an inertial system is incompatible with a photon that has no mass, no inertia.

Hello landlord The use of conditions in the special theory of relativity has defined the "principle of invariance of the speed of light" The principle of invariance of the speed of light: The speed of light in a vacuum is the same for any observer. The principle of invariance of the speed of light, in the special theory of relativity, refers to the fact that the propagation speed of light in a vacuum is a constant regardless of the inertial frame (inertial frame of reference) in which it is observed, and does not change with the relative motion of the light source and the frame of reference in which the observer is located.

The conditions for the establishment of the relative motion of the landlord with light must follow this principle, which is the principle of the invariance of the speed of light, a certain Schrödinger's cat.

Light-years are a unit of distance, not velocity, so they don't need to be measured.

The speed of light is about 300,000 kilometers and seconds, 20 billion light years, about:

300,000 kilometers seconds 3,600 seconds hours 24 hours days 365 days years 20 billion years.

Kilometers are known to be faster than the speed of light.

A light year is the distance that light travels in a straight line in a vacuum, which is simply the distance traveled by light in a year. Usually people have a certain misunderstanding of this concept, always think that the light year is a unit of time, but in fact, it is a unit of length, representing a very, very long distance, this distance, people can't imagine.

1. Definition and characteristics of light year: As the name suggests, the distance of light traveling in a straight line for a year is a unit of distance calculated from time and the speed of light. The specific value of a light-year is very large, 9,460,730,472,580,800 meters. Although the year is a unit of time, the addition of a light word in front of it does not form a unit of time, but a common unit in astronomy to measure the distance between celestial bodies.

2. The reason why light years arise is that our universe is very large, and in the universe, the distance between various celestial bodies is very far. If you use the common kilometer as the unit of distance, the calculated value will be very large and cumbersome. Therefore, previous scientists have worked together to develop a new unit, which is the light year.

With the light-year unit of distance, it is very easy to calculate the distance between celestial bodies in the universe, and the values will be smaller.

3. Application of the light yearThe main application of the light year is to facilitate the calculation of the distance between various celestial bodies in the universe. We can't imagine the length of a light year, but it can be calculated that it would take nearly 100,000 years for the world's fastest aircraft to fly at the fastest speed, and to fly a distance of 1 light year.

The distance between Proxima Centauri and the solar system, which is calculated in light years, is also light years.

A light-year is a unit of length in interstellar astronomy and is equal to meters; Yes, equal to the distance traveled by light in a sidereal year.

A light-year is a unit of length. It is used to measure the distance traveled in the universe of light for a year. To put it simply, a light year is the distance traveled by light in one year.

Yes, light-year means the distance that would take a year to reach at the speed of light.

The meaning of light year is the distance traveled by light in a year, and it is the distance traveled by light in a year.

The propagation velocity of light in a vacuum is 3 10 8 m s, and the light-year pattern refers to the distance that light travels in a year, so the light-year is a unit of length. The length of the enlightenment

If you want to explore the vast universe, it is completely impossible to use the current speed of human thrusters, not even the speed of light, because the current universe. The diameter is almost 93 billion light years, if we want to go from this end to that end at the speed of light, it means that it will take such a long time, of course, the human body does not have that long lifespan, even medical development is not possible, so if we want to really explore the universe, we must find a way to surpass the speed of lightAs for whether the current framework of physics is supported or not, this is not a question that we should consider, this is a question that physicists should consider.

It can't be measured, light year is a unit of distance light year, which means that it takes a year to travel at the speed of light, because people explore the process of the universe and find that the area of the universe is too large, so large that human beings can't measure the distance with kilometers at all.

Yes. A light-year is actually a unit of length, which refers to the distance that light travels in a year, and it needs to travel in a year.

No, you don't. Because a light-year is a unit of distance, which is a measure of the distance of an object, there is no need to actually go for a year.

None of them will answer you directly, I'll come. First of all, I would like to emphasize that what I said is not necessarily right, and now this kind of thing has not yet been decided, I can only give you a generally accepted answer, please correct if you say something wrong. If two gates travel in the same direction, the speed of one light relative to the other is still the speed of light, and there is no faster than the speed of light, if it is traveling in the same direction, one light is still the speed of light relative to the other.

Why? Because the speed of light is constant, it does not depend on the frame of reference. The Maxwell equation is described in it.

These are just personal opinions, and please give a better answer from the master, thank you.

The nature of light is very different from ours, and light cannot act as an observer.

In other words, one light cannot "see" another.

Therefore, the statement that "one light is faster than the speed of light relative to another" is incorrect.

Addendum: The principle of invariance of the speed of light is a basic assumption in the special theory of relativity.

Einstein proposed it as the basis for the theory.

After violating the special theory of relativity, it will probably be rewritten.

According to the principle of invariance of the speed of light in the special theory of relativity, the speed of light is the speed of light regardless of the type of inertial frame (including the inertial frame that moves at the speed of light).

It's originally a unit of length, you think, isn't the unit of distance that light travels in the universe in a year a meter, isn't the meter a unit of distance, has it made sense?

A light year is the distance that light travels in a year, right!