# The Naked Scientists Forum

### Author Topic: What is the effect of Earth's gravity on light?  (Read 1255 times)

#### thedoc

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##### What is the effect of Earth's gravity on light?
« on: 15/06/2012 23:30:02 »
Lujain Alyamani  asked the Naked Scientists:

What effect does gravity on earth have on light?

What do you think?
« Last Edit: 15/06/2012 23:30:02 by _system »

#### Pmb

• Neilep Level Member
• Posts: 1838
• Physicist
##### Re: What is the effect of Earth's gravity on light?
« Reply #1 on: 16/06/2012 14:33:10 »
As with any particle, the light is deflected.

#### syhprum

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##### Re: What is the effect of Earth's gravity on light?
« Reply #2 on: 16/06/2012 19:40:00 »
In a nutshell very little, all mass in the form of matter or energy distorts space time causing radiation to deviate from a straight line but the effect is very small the 2*10^30 Kg Sun causes a grazing light beam to deviate only approximatly 9 micro radians while the effect of the Earth is too small to measure.
« Last Edit: 19/06/2012 09:21:07 by syhprum »

#### LetoII

• Full Member
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##### Re: What is the effect of Earth's gravity on light?
« Reply #3 on: 19/06/2012 06:06:09 »
shouldnt you say it deviates a few micro radians over a certain distance, so that if you make the distance large enough then the deviation can become quite abit larger too?

#### syhprum

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##### Re: What is the effect of Earth's gravity on light?
« Reply #4 on: 19/06/2012 09:29:18 »
No the lateral distance a light spot would moved would of course vary with the distance from the deflecting source but the actual angle of deflection would remain virtualy the same except very close to the deflector.

#### The Naked Scientists Forum

##### Re: What is the effect of Earth's gravity on light?
« Reply #4 on: 19/06/2012 09:29:18 »