When light travels millions of years it should have lower speed . Is it possible to measure the speed of the light particle as it reaches earth from distant galaxies ?
2006-10-08 01:18:32 · 9 answers · asked by Natasha 1 in Science & Mathematics ➔ Astronomy & Space
When light travels millions of years it should have lower speed . Is it possible to measure the speed of the light particle as it reaches earth from distant galaxies ?
Just imagine that the speed of the light particle is reduced by 0.0001% ( 1by million ) every year, then after 1 million years ......?
2006-10-08 01:38:09 · update #1
The speed of light does not change with time . in relation to time , the speed of light is constand . It is only th emedium through which it travels that chnage the speed of light. The speed of light in vacum is 180000 miles per secnd in vacuum and as it enteres a medium that is denser , the speed is reduced and the change of speed causes a chnge in direction also and it cause the deflection . That what you see when light enters from air into a water . Once it enteres the a diffenent medium , its speed changes at the surface itself and thereafter , it continues to travel at the same reduced speed in the new medium . Once it comes out of that medium, it regains the original speed and travels at the speed at which ti usually can travel in that particular medium.So most part of space beig vacuum ,light will travel init at its absolute speed and when it in the course of its travel comes to pass through some denser medium , its speed wouod change and then again it comes to pass through vaccum , it woud again attain its absolute speed . so the speed of light will e affected by the different media it migh have to pass through wen it traels astonomical distnces and it is not affected by time , but by th edensity of th emedia only.
ther reason of space being vacuumis tht all the masses of the celstial bodies have a gravitational attraction which would attract all the substances and gases if any presentr in the space and hold them together close to its surface . so nothing can be out of the gravitational fields of the innumerable number of celestial bodies in space . So theris no possibility of even gases being out freely in the space . Consequently the space is vacuum and the atmosphere of the celestial bodie alone have gasses depending on the strength of the gravitational field .
So liht passes through vacuum only for most part in astronomical distances and rays that pass close to the gravitational fields of any planets or celestial bodies might get deflected to some extent and the resultant change of direction might cause a change in the speed of light by decreasing it .
2006-10-08 10:29:33 · answer #1 · answered by Infinity 7 · 0⤊ 0⤋
Light never changes speed, but it does get lower in frequency as the space it goes through is stretched out by the expansion of the universe. That's why light from distant galaxies is redder. The same thing that makes a train whistle sound lower in frequency as it goes away from you, even though the sound waves are hitting you at the same speed.
2006-10-08 04:18:03 · answer #2 · answered by Nomadd 7 · 0⤊ 0⤋
ya i can answer this question.......
i think u may know well about the "duality" of the light. that is it can behave as particles as well as like waves...... for your question light is not a particle it must be a wave... that is when light travels farther and farther it's frequency is getting decreased and not it's speed.....
i think u can differentiate between frequency as well as energy......
even if u consider it to be quantised photons no matter .... light from distant stars and galaxies are travelling thro' vacuum which has almost nothing to stop it or to absorb it.... so speed doesn't change but only it's energy contained in the quanta.....
u can remember the "Doppler effect" for why the frequency decreases with distance....
and after all did u get the answer if not mail me
thank you....
2006-10-08 17:26:13 · answer #3 · answered by ? 2 · 0⤊ 0⤋
speed of light is a good question
Its said that in General relativity(albert einstein), Light bends when come close to a very attractive particle like black hole or even a big star. Light can also slow down if entered into another medium.
man has already succesfully stopped light - newscientist.com
2006-10-08 01:48:16 · answer #4 · answered by Deepu 1 · 0⤊ 0⤋
A photon of electromagnetic energy will always move at the speed of light unless absorbed by some other matter or energy. Light speed is light speed.
2006-10-08 01:25:44 · answer #5 · answered by quntmphys238 6 · 0⤊ 0⤋
No, it is somewhat impossible. speedier than gentle alerts have the skill of best to causality violation. even with what the different poster suggested, the shown fact that black holes have an escape velocity that exceeds the value of light would not recommend that issues can circulate speedier than gentle. It potential that an merchandise could would desire to holiday speedier than gentle to flee - and not something does. concerning your added info, gravity would not substitute the value at which gentle strikes. it could upload and do away with potential from it, however the value of light (in a vacuum) is often the comparable.
2016-10-02 02:00:20 · answer #6 · answered by oberlander 4 · 0⤊ 0⤋
Yes it is. GOing through a vacuum, the speed of light is constant. That is why in E=MC2, the C squared is the speed of light squared.
2006-10-08 01:26:23 · answer #7 · answered by F T 5 · 0⤊ 0⤋
Speed of light supposedly one constant in known universe.
2006-10-08 01:27:01 · answer #8 · answered by James 3 · 0⤊ 0⤋
wt of light tends to zero....extremely small....not zero but not even more,very very less,n as it travels light behaves as a wave so no particle nature,thus no mass changes
2006-10-08 01:25:38 · answer #9 · answered by sammy k 2 · 0⤊ 0⤋