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Stars shine continuously, similarly to our Sun; light has been leaving it for millions of years, and will probably continue leaving it for millions of years more. The light we see NOW must have left about 228 years ago, if that's what you mean; since the distance to this star is estimated at 228 light-years.
What else can I help you with?
Why is the light overheated?
you left the light for too long. turn it off for a while and it will cool down
HOW LONG IS A TURNING RIGHT OR LEFT LIGHT CYCLE?
There is no answer to this as the lights are programmable.
How long has it been since Odysseus left Ithaca for the Trojan war?
20 years!
What does it mean when the sentence says, “All his children had long since left home.”?
The children left home long time or they were not at home
How do you determine how much an object has aged since its light left?
The speed of light is absolute, so you begin there. You know the distance between the Earth and the sun (from celestial mechanics originally), so now you have a general idea of how long it takes for light from such an object to get to to your eyes. Now you've spotted an object - a star, or distant galaxy, let's say - and ask how far away it is. You compare its light to that of objects (like the sun) that you know. A little math tells you that what you're seeing happened there a billion years ago.
How long human being survive without light?
ever since gooses roamed the earth
How long to keep uva light on turtle?
It should be left on all day, and off all night.
What change has occurred to the speed and wavelength of the light to cause the redshift?
We know that the frequency of light doesn't change once it leaves the source, and we know that as long as light stays in the same medium, its speed doesn't change. So if the color of visible light traveling through the vacuum of space has shifted toward the red end of the spectrum, then its wavelength has become longer since it left the source.
The part of Paris which is north of the river is known as the?
I think this is "the left bank". You look downstream to get the left and right, but it's been too long since I was there last.
How long will dark reactions run in the absence of light?
Dark reactions can continue to run in the absence of light since they are not dependent on light energy for their process. These reactions, such as the Calvin cycle, use the products of the light-dependent reactions to convert carbon dioxide into sugar molecules. Therefore, they can occur in the dark as long as the necessary molecules and enzymes are present.
How long has alpo got left on his jail sentence?
he got life so he will never see the light of outside prison
How long has light from other stars been traveling toward earth?
Well it depends on what you mean. The distance for how long it takes, or the time as in how long since Earth was made. Earth as you know has been here a long long time. Stars light has been shinning towards Earth eversince it was made. To see how long it takes for a stars light to reach Earth depends on how distant and huge the star is.
