Speed of light?
Our solar system moves through space at about 800,000 km/h, but if a flashlight is switched on on Earth, it can be measured over a certain distance that this light travels at almost the speed of light.
Shouldn't the speed at which our Earth moves through space be adjusted to the speed of light on Earth if the light from the flashlight moves in the same direction in which our solar system moves through space?
And wouldn't that mean the speed limit, which is limited to the speed of light, would be exceeded?
Thank you very much in advance. And please excuse my unscientific language; I'm not a physicist, just a 16-year-old teenager.
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No, the speed of light is an invariant, i.e. it has the same value in all reference systems. This is due to the fact that the time in a reference system, which is considered to be resting, passes in relation to this resting, slower. Time and space intervals between two events are not in variants. If one considers them from reference systems which move with different relative speeds to one another, they have different values. This is called time dilation and length or Lorentz contraction. However, since speed is measured over space and time intervals, it is not easy to add arithmetic speeds when the systems move relative to each other at high speed. It is then necessary to use another formula. The difference is not relevant for small speeds.
For interested parties:
The following formula applies:
vges = (v1 + v2)/(1 + v1 * v2)
ATTENTION:
As is customary in modern writing, the v are to be understood as multiples of the speed of light. v=1 is thus the speed of light and v=0.5 half the speed of light. If you’re using 1 for v1 and v2 for fun, 1 will get out as a result.
As a supplement to this, as something has already been said. Just because the LG is constant and remains, it is possible to measure the speeds of other stars etc. by the red light shift.
Of which: https://scienceblogs.de/astrodicticum-simplex/2010/08/09/warum-das-licht-non-mude-wird-redshift-und-supernovae/
You should also read the rest of the blog, it is really understandable. You will also find other interesting articles on astrophysics and other areas of natural science.
The red light shift can also be measured with your flashlight, but unfortunately the speeds for this are too low to be able to measure well.
Galilee velocity superposition does not work with light.
The so-called speed of light is the speed at which reality propagates. Nothing that has rest mass* can reach this speed, and only because photons do not have rest mass, they have this speed, therefore the name.
The name also comes from the fact that one thought earlier that the light needs a medium in which electromagnetic waves spread (like sound waves in air), the so-called ether. The question of what this aether was spatially defined led to the Michelson-Morley experiment, which was actually expected to measure different speeds of light in different directions at the speed of the Earth by the aether. Surprise: no difference, so no ether (unless it would happen to be stuck to the earth). This not only shows that there is no ether, but that this speed is a natural constant that is the same in all inertial systems and therefore cannot be overhauled, because if you try to overtake the beam of a flashlight by car, it is as fast as relative to the flashlight relative to the car.
Only here is the special relativity theory, which depicts quite simple mathematics (Lorentz transformations), which has the effect on times and lengths (and also the kinetic energy*) in moving systems.
*) Kinetic energy of objects with rest mass contains a term of Lorentz transformation such as times and lengths. If a vehicle is accelerated to the vicinity of the speed of light, an increasing proportion of the supplied energy goes to less and less speed increase and lets the vehicle always appear carrier for the external observer – the speed of light is never reached.
No, it does not move “approximately” with speed of light, but with the speed of light which is valid for the medium passing through.
No. The pure vectorial addition of speed only provides accurate results at speeds far below the speed of light. In the vicinity of the speed of light, it is necessary to reckon relatively.
https://de.wikipedia.org/wiki/Relativistics_Additionstheorem_f%C3%BCr_speeds
This happens
just not.
The speed of light is the ultimate limit. It is also not possible to increase the speed by accelerating the light source itself.