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This question already has an answer here:

  1. How fast does a Photon travel through space?

  2. And is gravity able to influence a Photon's path?

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marked as duplicate by Kyle Kanos, DarenW, Mark Mitchison, Qmechanic Feb 12 '15 at 19:34

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I'm not sure if I'm missing something here, but is the answer not c, the speed of light, 186000mph? A photon is a particle of light, but as it has no mass it can travel at the speed of light.

As for the second part, yes it can be influenced by gravity. As an example, gravitational lensing (the bending of light) around galaxies, making objects behind appear distorted into a ring around the lensing object

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  • $\begingroup$ Depends on what medium the photon is traversing, if it isn't vacuum it won't be quite $c$ $\endgroup$ – Spine Feast Feb 12 '15 at 19:25
  • $\begingroup$ that is true, I forgot about that. $\endgroup$ – stanley dodds Feb 12 '15 at 19:28
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    $\begingroup$ ~ 186,000 miles/second not per hour $\endgroup$ – MarkWayne Feb 6 '18 at 23:09

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