What happens to light over time? If light stays light the universe should be a bright place but it looks dark?
345361
The Big Bang theory offers a resolution of your question (also known as Olbers's Paradox). In a universe with a beginning we can receive light only from that part of the universe close enough so that light has had time to travel from there to here since the Big Bang (about 10 billion years ago). So, even if space extends infinitely far, only a limited region, and a limited number of stars, are visible to us. And the accumulated light from this limited number of stars is not sufficient to spoil the darkness of the night sky.\n\nGod is spelled B-I-G B-A-N-G\nPBrax@netscape.com
381943
As the others have said, all light travels at exactly the same speed.  This is even true if the observer and/or the  light source are moving very very fast.  Once this was proved by experiment, everyone was very upset until Einstein figured it out and showed that time and space can distort. If you want a real bad headache, you can read all about this.  If it doesn't give you a headache, become a physicist!
411180
The universe is so large that light from some places which has been traveling towards us since the moment after the Big Bang still hasn't had time to reach us.  The universe is 13.7 billion years old.  That makes the observable universe 13.7 billion light years across.  Since a light year is nearly 6 trillion miles, the observable universe is larger than you can probably imagine.\n\nAlso, the universe is expanding at such a rate that light from its farthest reaches will never be able to get here.  Since you can never travel faster than light, there is no way anyone from Earth will ever be able to see if the universe ends.
585811
This question may be interpreted in two ways.  First, why is the sky not blue at night?  The answer for that is that the sky appears blue during the day because it scatters high energy sunlight.  The atmosphere scatters high energy starlight as well, but there isn't enough of that to make the sky appear blue.\n\nThe other interpretation is why is the sky not totally lit by stars?  That is actually a very important question that was pondered by famous astronomers.  It is called the Dark Night Sky Paradox, or Olbers' Paradox, and was contemplated by such notables as Halley and Kepler as well as the eponymous Heinrich Wilhelm Olbers.  If the universe is of infinite age (as was once assumed) and static, and the stars have had eternity to shine, shouldn't the sky be lit?  \n\nSome people hypothesized that the stars did not appear randomly in all directions.  (So the stars are arranged in straight lines with the Earth at the center so that starlight piles into intervening stars, and there are empty gaps?  Even before Hubble proved that "dark sky" is teeming with distant galaxies, that sounded stupid.)  Others said that dust in the way absorbed starlight.  But after an eternity of absorbing starlight, wouldn't the dust glow as well, and light up the night sky?\n\nThe fact that space is dark turns out to be proof in part that the Universe is not infinite, eternal, and static.  That in fact it had a beginning point in time and space and the Universe is changing.
541125
Light only travels until it is absorbed, dissipated to other types of radiation (no longer referred to as "light"), or expended as some other form of energy.\n\nThis can mean "forever". Of course, that depends on various important factors of light which rely on concrete proof. At the moment, there are differing theories about how light works, why, and what it is.
5022
This is the same as the speed of light.  Dark is simply the relative absence of light.  The sun could stop shining and we would not know for like eight minutes.  (Not that the sun would just stop shining, but use your imagination.)
855043
It's all theory, we don't know if (something) can exceed the speed of light. I would argue that time would be void at that moment, but again it's my theory. Interesting thought though.
44895
Interesting quatum phenomenon question.  The lights would come on, but they might appear strange to an observer due to the Doppler effect.  You, inside the car, would continue to see a headlight 'beam' because light's speed is a universal constant and not dependent on the speed of the source.  However, traveling beyond the speed of light in conventional space is not possible, to our knowledge.  For one, it would require infinate energy.  It would also cause macro-scale collapses in casaulity (effects happening before the cause).  To date, these bizzare effects have only been seen on quantum scales.
1066323
u see darkness because light isn't present. Not whether is it possible to look at nothing.
49948
the same thing thats on this side. new matter is not being formed it is just expanding from the force of the big bang all those millions of years ago. Some scientists say the expansion will eventually stop and the universe will collapse onto itself, and then maybe explode again. All theories so in effect we dont know.
330302
Light is a kind of energy that can travel through space. Light from the sun or a light bulb looks white, but it is really a mixture of many colors. The colors in white light are red, orange, yellow, green, blue and violet. You can see these colors when you look at a rainbow in the sky. \n\nThe sky is filled with air. Air is a mixture of tiny gas molecules and small bits of solid stuff, like dust. \n\nAs sunlight goes through the air, it bumps into the molecules and dust. When light hits a gas molecule, it may bounce off in a different direction. Some colors of light, like red and orange, pass straight through the air. But most of the blue light bounces off in all directions. In this way, the blue light gets scattered all around the sky. \n\nWhen you look up, some of this blue light reaches your eyes from all over the sky. Since you see blue light from everywhere overhead, the sky looks blue. \n\nIn space, there is no air. Because there is nothing for the light to bounce off, it just goes straight. None of the light gets scattered, and the "sky" looks dark and black.
83472
Space is technically a vacuum, hence void of any matter, invisible, see-through, like a very clean window! That's also why they placed the Hubble Telescope in orbit, out of the atmosphere.  The atmosphere seriously effects a telescope's ability to 'see' far into the universe.  It's essentially like looking through a dirty glass, because of all the particulate.\n\nSo,\nIn space no physical matter, no perception of light.  There is no air and/or physical matter for the light to bounce off of and around etc..\nIn other words, the reflections of light from objects creates the effect we perceive as light, or being lit-up.  \n\nAny solid will also be illuminated by the sun, in space. Proof of that is the moon, or any other planets visible by eye or telescope.  \n\nOur atmosphere (air is matter too) gives the appearance of being "lit" up, and all the solids on earth reflect that light, causing the effect of being "lit up"..\n\nTry this.  Go into a completely dark room, and turn on a good straight beam flashlight.  Can you see the particulate in the air?  The little lighted particles?  If they weren't there, all you would see is the white dot on the wall, that the light creates.  The reason you can put your hand next to the beam and still see it is from the reflection on the wall, AND the particle matter in the air, which causes light to stray onto your hand.  In this case it's more the reflection, but both aid in you seeing your hand..\n\nNow, take that HUGE flashlight in the sky *sun*, and apply that to what you have asked!
500819
Your question is completely hypothetical. Light travels. Gravity does not. Interesting scenario, however. If such were to happen, I really don't know what the answer would be.
977539
On the contrary, a light beam would merely percieve that it travelled instantly inbetween origin and destination. Space would be warped to Zero distance in the direction of travel, not Zero space. I know it seems like a sleight-of-hand trick with the mathematics, but the distinction is important.
328994
Dark does not push light away, the light is what is moving. Using your example of "over the horizon", the sun (which produces light) moves to the other side of the earth (where we can't see it) then we see dark. But dark does not move, it is just the term we have come up with for what it looks like when there is no light present.
1110351
It is the speed of light.\n\nDarkness is gone at the speed of light when light approaches it at speed of light... when the light moves away at the speed, darkness appears at same speed.
524831
It takes millions of years for the light from a star to get here. If you look at the stars you are seeing the stars light from a million years ago so if you see a star in the sky it might have already gone out. For instance if a star was born 5 million years ago if you go outside and it is there for the first time you are seeing what it was like 5 million years ago. The star is 5 million years old