Can Light Particles Propel Spacecraft to the Speed of Light?

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SUMMARY

Light particles, or photons, cannot be caught in a conventional sense, but their momentum can be harnessed to propel spacecraft using solar sails. While it is impossible for massive objects to reach the speed of light, they can approach it closely. The speed of light, approximately 3 x 108 m/s, is determined by the permeability and permittivity of space, as described by Maxwell's equations. The discussion also touches on the relationship between the speed of light and the Higgs field, emphasizing that massless particles travel at light speed while massive particles do not.

PREREQUISITES
  • Understanding of photon momentum transfer
  • Familiarity with solar sail technology
  • Knowledge of Maxwell's equations
  • Basic concepts of permeability and permittivity of space
NEXT STEPS
  • Research solar sail propulsion systems
  • Study Maxwell's equations and their implications for light speed
  • Explore the Higgs field and its role in particle mass
  • Investigate the concept of natural units in theoretical physics
USEFUL FOR

Physicists, aerospace engineers, and anyone interested in advanced propulsion technologies and the fundamental principles of light and space.

Killer slug
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is it possible to catch light particles and have them push you along in some kind of space ship, and if you could would it be the speed of light
 
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No, but apparently swans make good propulsion for early space craft. Light particles or "Photons" are packets of energy that you can't catch. If you were to try and "grab" one with your hand and catch a ride you may be disappointed. Traveling at light speed is impossible for such a large mass as yourself, but seriously swans all the way...
 
Actually, every time a photon hits you and you absorb it, you have "caught" it. And when you do, it transfers its momentum to you. So yes, you could propel a spaceship that way (actually, reflecting them is better...), but you'd need an enormous solar sail to catch enough photons to be useful. And no, you could never reach the speed of light. You could get arbitrarily close to it, though.

Anyway, look here: http://en.wikipedia.org/wiki/Solar_sail
 
"swans"? Is that a technical term.

"Light Sails" have long been a staple of science fiction. I don't know if NASA is doing any research but it would certainly been possible.
 
Why is the speed of light limited to 3*10^8 m/s? What is blocking it from going faster than that?
 
The speed of lights is an absolute maximum to speed, because it is the rate at which time flows. The digits it is expressed as are based on our units of measurement.
 
The speed of light is not the rate at which time flows.

The speed of light is a dictated by the permeability and permittivity of space, as a consequence of Maxwell's equations.
 
Well Watters has explained it clearly...
 
lanman said:
it is the rate at which time flows.

Not sure where I heard that...
 
  • #10
lanman said:
Not sure where I heard that...

In a sense, c is the conversion rate between space and time. In many theoretical papers, "natural" units are adopted, where c = 1, \hbar = 1, etc. So that mass, length, time are all inter-convertible without changing the number.
 
  • #11
russ_watters said:
The speed of light is a dictated by the permeability and permittivity of space, as a consequence of Maxwell's equations.

From the speed of light, did we derive the permeability and permittivity of space, or is it the other way?

Can anyone explain permeability and permittivity of space in simpler terms? I googled those keywords, but gave me pages with lots of greek symbols, which I used to understand in the past, for a short period in my life.
 
  • #12
I would think that the definition of c, the speed of light, would rely somewhat on the Higgs field - that which endows mass upon particles. Massless particles travel at the speed of light, massive ones at less than c.
 
  • #13
jobyts said:
From the speed of light, did we derive the permeability and permittivity of space, or is it the other way?
If I understand the history correctly, I think they were measured about the same time the first accurate measurements of the speed of light were being taken (by Michelson). So the speed of light was separately measured and calculated and found to be the same value.
Can anyone explain permeability and permittivity of space in simpler terms? I googled those keywords, but gave me pages with lots of greek symbols, which I used to understand in the past, for a short period in my life.
Basically, the resistance to passing magnetic and electric fields.
 
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