Nothing with mass travels faster than light

Nothing with mass can travel faster than the speed of light in a vacuum (c ≈ 299,792,458 m/s).

This speed limit applies to objects with mass, like particles, atoms, and even spaceships. However, it doesn't directly relate to time.

Time is a dimension, not an object that moves.

In relativity, time is an integral part of spacetime, which combines space and time. Time dilation and length contraction occur when objects approach the speed of light, but time itself doesn't "move" or "travel."

Time is relative, and its measurement depends on the observer's frame of reference.

According to general relativity (1915), gravity warps spacetime, causing time to curve and pass differently at various locations. This effect, known as gravitational time dilation, shows that time is not absolute.

*Light always travels at the same speed, but time appears to pass differently for observers in different states of motion.*

Consider this thought experiment:

1. Alice stays on Earth.

2. Bob travels at 90% of the speed of light relative to Alice.

From Alice's perspective, Bob's clock appears to run slower due to time dilation. However, from Bob's perspective, his clock runs normally, and Alice's clock appears to run faster.

1. Light's speed is constant and unchanging.

2. Time is relative and dependent on the observer's frame of reference.

3. Time dilation and length contraction occur when approaching the speed of light

Light doesn't travel faster than time


measurement changes depending on the observer's frame of reference.

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