Speed of Light Aboard a Spaceship: An Overview

In summary, the conversation discusses the behavior of light in a spaceship moving at a constant speed of 0.99 c relative to Earth. It is explained that according to special relativity, light moves at the speed of light (c) relative to all observers, regardless of the speed of the source. It is also recommended to read Taylor & Wheeler's Spacetime Physics for a better understanding of the basics of special relativity.
  • #1
TheLil'Turkey
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Let's say a spaceship made of a transparent material moving past the Earth in a straight line at a constant speed of 0.99 c, and it's at its minimum distance from Earth. If a light is turned on in the middle of the ship, for an observer on Earth will the light move towards the front of the ship at the speed c (with a speed of 0.01 c relative to the front of the ship) and towards the back of the ship at the speed c (with a speed of 1.99 c relative to the back of the ship?

If time moves more slowly on the ship for an observer on Earth, shouldn't light move equally slowly in any direction relative to the ship?

I'd like to understand the basics of special relativity; what should I read? The part of Feynman's lectures on physics that deals with this is all that I've read so far.
 
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  • #2
TheLil'Turkey said:
If a light is turned on in the middle of the ship, for an observer on Earth will the light move towards the front of the ship at the speed c (with a speed of 0.01 c relative to the front of the ship) and towards the back of the ship at the speed c (with a speed of 1.99 c relative to the back of the ship?

Light moves at ##c## relative to the ship. Velocities don't add linearly in relativity; see here:

http://en.wikipedia.org/wiki/Velocity-addition_formula#Special_theory_of_relativity

If you apply this formula when ##v = c##, you will see that it gives ##s = c## regardless of the value of ##u##; so light moves at ##c## relative to all observers.

TheLil'Turkey said:
I'd like to understand the basics of special relativity; what should I read?

Taylor & Wheeler's Spacetime Physics is a good introductory text.
 

Related to Speed of Light Aboard a Spaceship: An Overview

1. What is the speed of light aboard a spaceship?

The speed of light aboard a spaceship is the same as the speed of light in a vacuum, which is approximately 299,792,458 meters per second (or 186,282 miles per second). This is known as the universal speed limit and is denoted by the letter "c" in physics equations.

2. Does the speed of a spaceship affect the speed of light?

No, the speed of a spaceship does not affect the speed of light. According to Einstein's theory of relativity, the speed of light is constant and does not change regardless of the observer's frame of reference.

3. Can a spaceship travel faster than the speed of light?

No, it is currently believed that nothing can travel faster than the speed of light. As mentioned before, the speed of light is the universal speed limit and any object that has mass cannot reach or exceed this speed.

4. How does the speed of light affect time aboard a spaceship?

Einstein's theory of relativity also states that time appears to pass slower for an object in motion compared to an object at rest. This phenomenon, known as time dilation, means that time aboard a spaceship traveling at high speeds will appear to pass slower compared to someone on Earth. However, this effect is only noticeable at speeds close to the speed of light.

5. Is the speed of light constant in all directions aboard a spaceship?

Yes, the speed of light is constant in all directions aboard a spaceship. This is because the laws of physics are the same in all frames of reference, meaning that the speed of light remains constant regardless of the direction the spaceship is traveling.

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