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The **rest mass** of photon = 0. **Invariant mass** of photon also = 0

m^2c^4 = E^2 - (pc)^2 = 0

Einstein’s theory says that even pure energy has to behave in some ways like mass. Therefore light could be bend by the gravitation force of the Sun.

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4SE, Coronado Solarmax II 60

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Digital Cameras: Canon 60Da and 40D. CCD: NexImage

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EPs: Celestron

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& Filter Accessory Kit - 1.25", T-Adapter with

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Universal, Other: Bahtinov focus mask

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: Registax 6, Stellarium, PhotoShop, Deep Sky Stacker, AMCap

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my backyard videos about

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astrophotos

http://astro-photos.blogspot.com/ - Astrophotography blog