How to Measure Distance

In the absence of neutrinos everything shrinks, and ordinary matter and photons melt together into a single block of matter that resonate in harmony.

To an outside observer, the space lacking in neutrino becomes a single particle moving at the speed of light. The speed of light inside the space appears to have stopped.

Conversely, if a space is subjected to a strong repelling electric force so that there becomes an over-abundance of neutrinos in that space, things become bigger. The outside observer will see things grow.

To a local observer, everything look the same because the observer grows too. The observer's clock changes a little due to the increased space. It ticks a little slower, because the photons inside have farther to travel from one point to another. However, this slowing down is only observed from the outside. No such change can be detected locally.

There is no way for the local observer to detect that the ruler has grown, because the observer has grown too, and the clocks, both biological and mechanical have slowed down correspondingly.

Measuring the speed of light, the local observer sees no change in anything.

Also, if an outside observer uses the local clock and yardstick to calculate the speed of light, there is no change. The increase in length of the yardstick is compensated for by the slowing down of the clock.

Using the outside clock and yardstick, the outside observer registers a change in the local time and distance. However, when applied to the speed of light inside the local space, the outside yardstick and clock end up with the exact same speed of light as measured using the local yardstick and clock.

When it comes to the relationship between distance and time, it does not matter whether the measuring equipment is local or external. The distance traveled by light during one click of a clock is always the same, provided both the clock and the yardstick are in the same frame of reference.

This is why the speed of light is a constant, no matter which reference frame we use.

The practical consequence of this is that we can always measure distance by the use of a laser and a clock.