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Re:First habitable exoplanet discovered? by Confusion on Tuesday May 17, 2011 @12:48AM (#2555311)

  If the planet is 20 light years away, you're saying we 
  could reach it in less than a year if we attain a velocity
  of 0.9999c?
Yes. In the reference frame of the traveler, very little time passes. However, when he returns, people on earth will have aged more than 40 years.

This is also why particles traveling at c cannot possibly decay: no time passes for them. A photon is everywhere at once, from its own point if view.

Re:First habitable exoplanet discovered? by aik on Tuesday May 17, 2011 @01:21AM (#2555373)
Amazing. I hope to some day wake up and have a deep conceptual understanding of the relationship between velocity and time in relation to the various bodies at play.

I also hope to have an understanding of what it means for a photon to be everywhere at once, from its own point of view.

In the end, I guess I just want to understand the universe just a bit more than I do.

Re:First habitable exoplanet discovered? by dodo53 on Tuesday May 17, 2011 @04:25AM (#2555721)
Special relativity is actually quite accessible and really interesting - find a good book or set of lectures on iTunes U or something. (General relativity, the generalised version including acceleration and gravity, is what makes people think relativity is hard).
Re:First habitable exoplanet discovered? by shazow on Tuesday May 17, 2011 @01:23AM (#2555376)

  This is also why particles traveling at c cannot possibly
  decay: no time passes for them. A photon is everywhere at
  once, from its own point if view.
That's a really great explanation. For the first time, I've been able to visualize how light can be both a particle and a wave. Thank you.
Re:First habitable exoplanet discovered? by DavidSJ on Tuesday May 17, 2011 @03:16AM (#2555603)
Time dilation (special relativity) has nothing to do with wave-particle duality (quantum physics). The infinite time dilation of photons is due to their velocity, not their wave-like nature.

Furthermore, all particles (electrons, protons, quarks, etc.) have wave-particle duality just as much as photons do.

Re:First habitable exoplanet discovered? by blots on Tuesday May 17, 2011 @05:59AM (#2555900)
Wave-particle duality is even observable with larger molecules: http://link.aps.org/doi/10.1103/PhysRevLett.88.100404
Re:First habitable exoplanet discovered? by shazow on Tuesday May 17, 2011 @02:38PM (#2557347)
Thanks for the correction. s/wave/continuous beam/.